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Conrad Grebel (c. 1498 – 1526), son of a prominent Swiss merchant and councilman, was a co-founder of the Swiss Brethren movement.
Conrad Grebel was born, probably in Grüningen in the Canton of Zurich, about 1498 to Junker Jakob and Dorothea (Fries) Grebel, the second of six children. He spent his early life in Grüningen, and then came to Zurich with his family around 1513. He spent several years abroad in study, worked as a proofreader in Basel, married in 1522, and became a Christian minister around 1523.
Conrad Grebel is thought to have studied for six years at the Carolina, the Latin school of the Grossmünster Church in Zürich. He enrolled at the University of Basel in October 1514. While there he studied under Heinrich Loriti, a noted humanist scholar. His father acquired a stipend from Emperor Maximilian for Conrad to study at the University of Vienna. In 1515 he began attending there and remained until 1518. While there, Grebel developed a close friendship with Joachim Vadian, [lower-alpha 1] an eminent Swiss humanist professor from St. Gall. After spending three years in Vienna he returned to Zürich for about three months. His father acquired a scholarship for Conrad from the King of France to attend the University in Paris. He spent two years in study there, and joined the boarding academy of his former teacher in Basel, Loriti. In Paris Grebel engaged in a loose lifestyle, and was involved in several brawls with other students. When Grebel's father received word of his son's demeanor, he cut off Conrad's funds and demanded that he return to Zurich. Conrad Grebel spent about six years in three universities, but without finishing his education or receiving a degree.
In 1521 Grebel joined a group gathered to study with Huldrych Zwingli. With him they studied the Greek classics, the Latin Bible, the Hebrew Old Testament and the Greek New Testament. It was in this study group that Grebel met and developed a close friendship with Felix Manz.
Conrad Grebel probably experienced a conversion in the spring of 1522. His life showed a dramatic change, and he became an earnest supporter of the preaching and reforms of Zwingli. He rose to leadership among Zwingli's young and enthusiastic followers. This close following and enthusiastic support of Zwingli was challenged by the Second Disputation [lower-alpha 2] in Zurich in October 1523. Grebel and Zwingli broke over abolishing the Mass. Zwingli argued before the council for abolishing the Mass and removing images from the church. But when he saw that the city council was not ready for such radical changes, he chose not to break with the council, and even continued to officiate at the Mass until it was abolished in May 1525. Grebel saw this as an issue of obeying God rather than men, and, with others, could not conscientiously continue in that which they had condemned as unscriptural. These young radicals felt betrayed by Zwingli, while Zwingli looked on them as irresponsible.
About 15 men broke with Zwingli, and, while taking no specific action at that time, they regularly met together for prayer, fellowship and Bible study. During this time of waiting for direction from God, they sought religious connections outside of Zürich. Grebel wrote to both Andreas Karlstadt and Martin Luther in the summer of 1524, and to Thomas Müntzer in September. Karlstadt traveled to Zürich and met with them in October of that year. Despite apparent similarities, no connection between the Zürich radicals and Karlstadt ever came to fruition. In his letter to Müntzer, Grebel encouraged Müntzer in his opposition to Luther, but also reproached him for several errors he felt he was making. He urged Müntzer not to take up arms. The letter was returned to Grebel, having never reached Müntzer.
The final question to completely sever ties between the radicals and Zwingli was the question of infant baptism. A public debate was held on 17 January 1525. Zwingli argued against Grebel, Manz and George Blaurock. The city council decided in favor of Zwingli and infant baptism, ordered the Grebel group to cease their activities, and ordered that any unbaptized infants must be submitted for baptism within 8 days. Failure to comply with the council's order would result in exile from the canton. Grebel had an infant daughter, Issabella, who had not been baptized, and he resolutely stood his ground. He did not intend for her to be baptized.
The group met together for counsel on 21 January in the home of Felix Manz. This meeting was illegal according to the new decision of the council. George Blaurock asked Grebel to baptize him upon a confession of faith. [lower-alpha 3] Afterward, Blaurock baptized the others who were present. As a group they pledged to hold the faith of the New Testament and live as fellow disciples separated from the world. They left the little gathering full of zeal to encourage all men to follow their example.
Being well known in Zürich, Grebel left the work to others and set out on an evangelistic mission to the surrounding cities. In February, Grebel baptized Wolfgang Ulimann by immersion in the Rhine River. Ulimann was in St. Gall, and Grebel traveled there in the spring. Conrad Grebel and Wolfgang Ulimann spent several months preaching with much success in the area of St. Gall. In the summer he went to Grüningen and preached with great effect. In October 1525 he was arrested and imprisoned. While in prison, Grebel was able to prepare a defense of the Anabaptist position on baptism.  Through the help of some friends, he escaped in March 1526. He continued his ministry and was at some point able to get his pamphlet printed. Grebel removed to the Maienfeld area in the Canton of Grisons (where his oldest sister lived). Shortly after arrival he died, probably around July or August.
The extant works of Conrad Grebel consist of 69 letters written by him from September 1517 to July 1525, three poems, a petition to the Zürich council, and portions of a pamphlet written by him against infant baptism, as quoted by Zwingli in his counterarguments. Three letters written to Grebel (Benedikt Burgauer, 1523; Vadian, 1524; and Erhard Hegenwalt, 1525) have been preserved. The majority of the 69 letters written by Grebel are from his student years, however, and shed little light on his ministry as an Anabaptist.
Though his entire life was less than 30 years, his Christian ministry was compressed into less than four years, and his time as an Anabaptist was only about a year and a half, Conrad Grebel's impact earned him the title "the Father of Anabaptists". [lower-alpha 4] Grebel performed the first known adult baptism associated with the Reformation, and was referred to as the "ringleader" of the Anabaptists in Zürich. Zwingli complained of no major differences with Grebel on cardinal points of theology, and minimized Grebel's differences as "unimportant outward things, such as these, whether infants or adults should be baptized and whether a Christian may be a magistrate." Yet these differences reveal a deep division of thought on the nature of the church, and the relationship of the church and the Christian to the world. The beliefs of Conrad Grebel and the Swiss Brethren have left an impression on the life and thought of Amish, Baptist, Schwarzenau Brethren/German Baptist, and Mennonite churches, as well as numerous pietistic and free church movements. The Bruderhof Communities, founded in 1920,  draw inspiration from the beliefs and actions of Conrad Grebel and the other reformation era Anabaptists.  Where others only longed for restitution or shrank from too much reform, Grebel and his group acted decisively and at great personal risk. Freedom of conscience and separation of church and state are two great legacies of the Anabaptist movement initiated by these Swiss Brethren.
With Petr Chelčický (1390–1460) of Bohemia, Conrad Grebel is considered one of the first nonresistant Christians of the Reformation.
In 1961 a Mennonite University College was named after him in Waterloo, Ontario.
The Grebels had been a prominent Swiss family for over a century before Conrad's birth. His father Jakob was an iron merchant and served as a magistrate in Grüningen from 1499 to 1512. After that he served as a representative on the council of the Canton of Zürich, and was also frequently called upon as an ambassador for Zürich to meetings of the Swiss Confederation. Jakob Grebel disagreed with his son's religious sentiments, but he also thought Zwingli's measures against the Anabaptists were too harsh. Jakob Grebel was executed in Zürich on 30 October 1526, having been convicted of receiving illegal funds from foreign rulers. Some scholars consider his opposition to the measures of Zwingli as a likely reason behind the execution.
Against his family's wishes, Conrad Grebel married Barbara on 6 February 1522[ citation needed ]. Children were born to this union, and relatives raised the children after the death of Conrad. Ironically, the children were raised in the Reformed faith, and the family name once again became prominent in Zürich. His grandson, also named Conrad, was the city's treasurer in 1624, and a later descendant also named Conrad Grebel was burgomaster in 1669. Even in recent times, Grebel descendants have served the courts and parishes of Zürich.
In 1961 a Mennonite University College, Conrad Grebel University College, was named after him in Waterloo, Ontario. 
Anabaptism is a Protestant Christian movement which traces its origins to the Radical Reformation.
Huldrych or Ulrich Zwingli was a leader of the Reformation in Switzerland, born during a time of emerging Swiss patriotism and increasing criticism of the Swiss mercenary system. He attended the University of Vienna and the University of Basel, a scholarly center of Renaissance humanism. He continued his studies while he served as a pastor in Glarus and later in Einsiedeln, where he was influenced by the writings of Erasmus.
Mennonites are members of certain Christian groups belonging to the church communities of Anabaptist denominations named after Menno Simons (1496–1561) of Friesland. Through his writings, Simons articulated and formalized the teachings of earlier Swiss founders, with the early teachings of the Mennonites founded on the belief in both the mission and ministry of Jesus, which the original Anabaptist followers held with great conviction, despite persecution by various Roman Catholic and Protestant states. Mennonite beliefs were codified in the Dordrecht Confession of Faith in 1632, which affirmed "the baptism of believers only, the washing of the feet as a symbol of servanthood, church discipline, the shunning of the excommunicated, the non-swearing of oaths, marriage within the same church, strict nonresistance, and in general, more emphasis on true Christianity involving being Christian and obeying Christ".
Year 1525 (MDXXV) was a common year starting on Sunday of the Julian calendar.
The Swiss Mennonite Conference is an Anabaptist Christian body in Switzerland.
Felix Manz was an Anabaptist, a co-founder of the original Swiss Brethren congregation in Zürich, Switzerland, and the first martyr of the Radical Reformation.
Balthasar Hubmaier was an influential German Anabaptist leader. He was one of the most well-known and respected Anabaptist theologians of the Reformation.
Jörg vom Haus Jacob, commonly known as George Blaurock, was an Anabaptist leader and evangelist. Along with Conrad Grebel and Felix Manz, he was a co-founder of the Swiss Brethren in Zürich, and thereby one of the founders of Anabaptism.
The Zwickau Prophets were three men of the Radical Reformation from Zwickau in the Electorate of Saxony in the Holy Roman Empire, who were possibly involved in a disturbance in nearby Wittenberg and its evolving Reformation in early 1522.
Andreas Rudolph Bodenstein von Karlstadt, better known as Andreas Karlstadt or Andreas Carlstadt or Karolostadt, or simply as Andreas Bodenstein, was a German Protestant theologian, University of Wittenberg chancellor, a contemporary of Martin Luther and a reformer of the early Reformation.
Leo Jud, known to his contemporaries as Meister Leu, was a Swiss reformer who worked with Huldrych Zwingli in Zürich.
Ludwig Haetzer was an Anabaptist.
The Radical Reformation represented a response to corruption both in the Catholic Church and in the expanding Magisterial Protestant movement led by Martin Luther and many others. Beginning in Germany and Switzerland in the 16th century, the Radical Reformation gave birth to many radical Protestant groups throughout Europe. The term covers radical reformers like Thomas Müntzer and Andreas Karlstadt, the Zwickau prophets, and Anabaptist groups like the Hutterites and the Mennonites.
The Swiss Brethren are a branch of Anabaptism that started in Zürich, spread to nearby cities and towns, and then was exported to neighboring countries. Today's Swiss Mennonite Conference can be traced to the Swiss Brethren.
The theology of Ulrich Zwingli was based on an interpretation of the Bible, taking scripture as the inspired word of God and placing its authority higher than what he saw as human sources such as the ecumenical councils and the church fathers. He also recognised the human element within the inspiration, noting the differences in the canonical gospels. Zwinglianism is the Reformed confession based on the Second Helvetic Confession promulgated by Zwingli's successor Heinrich Bullinger in the 1560s.
The Groffdale Conference Mennonite Church, also called Wenger Mennonites, is the largest Old Order Mennonite group to use horse-drawn carriages for transportation. Along with the automobile, they reject many modern conveniences, while allowing electricity in their homes and steel-wheeled tractors to till the fields. Initially concentrated in eastern Lancaster County, Pennsylvania, their numbers had grown to 22,305 people resided in eight other states as of 2015. They share the pulpit with the Ontario Mennonite Conference but have some differences in Ordnung.
Believer's baptism or adult baptism is the practice of baptizing those who are able to make a conscious profession of faith, as contrasted to the practice of baptizing infants. Credobaptists believe that infants incapable of consciously believing should not be baptized.
Wilhelm Reublin was a leading figure of the Swiss Brethren movement. Reublin was born in 1484 in Rottenburg am Neckar. In 1521, after studying theology in Freiburg and Tübingen, Reublin became the pastor at St. Alban in Basel and began to advocate reform. St. Alban was soon the center of the evangelical movement in Basel. In the Fall of 1522 Reublin was expelled from the city for his Reformation sermons and moved to Witikon in 1524, where he became the local pastor and preached against infant baptism. Reublin was with Conrad Grebel and Felix Manz in Zürich in January 1525 at the birth of the Anabaptist movement. Reublin took part in a disputation on 17 January 1525 after which Grebel, Mantz and Reublin were given eight days to leave the canton.
The Weaverland Conference, also called Horning Church or Black-bumper Mennonites is a Christian denomination of Old Order Mennonites who use cars.
The Reformation in Zürich was promoted initially by Huldrych Zwingli, who gained the support of the magistrates of the city of Zürich and the princess abbess Katharina von Zimmern of the Fraumünster Abbey, and the population of the city of Zürich and agriculture-oriented population of the present Canton of Zürich in the early 1520s. It led to significant changes in civil life and state matters in Zürich and spread to several other cantons of the Old Swiss Confederacy, and thus initiated the Reformation in Switzerland.