Amalric or Amaury I was King of Jerusalem from 1163, and Count of Jaffa and Ascalon before his accession. He was the second son of Melisende and Fulk of Jerusalem, and succeeded his older brother Baldwin III. During his reign, Jerusalem became more closely allied with the Byzantine Empire, and the two states launched an unsuccessful invasion of Egypt. He was the father of three future rulers of Jerusalem, Sibylla, Baldwin IV, and Isabella I.
Baldwin III was King of Jerusalem from 1143 to 1163. He was the eldest son of Melisende and Fulk of Jerusalem. He became king while still a child, and was at first overshadowed by his mother Melisende, whom he eventually defeated in a civil war. During his reign Jerusalem became more closely allied with the Byzantine Empire, and the Second Crusade tried and failed to conquer Damascus. Baldwin captured the important Egyptian fortress of Ascalon, but also had to deal with the increasing power of Nur ad-Din in Syria. He died childless and was succeeded by his brother Amalric.
Nūr al-Dīn Maḥmūd Zengī, commonly known as Nur ad-Din, was a member of the Zengid dynasty, who ruled the Syrian province of the Seljuk Empire. He reigned from 1146 to 1174. He is regarded as an important figure of the Second Crusade.
Bohemond III of Antioch, also known as Bohemond the Child or the Stammerer, was Prince of Antioch from 1163 to 1201. He was the elder son of Constance of Antioch and her first husband, Raymond of Poitiers. Bohemond ascended to the throne after the Antiochene noblemen dethroned his mother with the assistance of the lord of Armenian Cilicia, Thoros II. He fell into captivity in the Battle of Harim in 1164, but the victorious Nur ad-Din, atabeg of Aleppo released him to avoid coming into conflict with the Byzantine Empire. Bohemond went to Constantinople to pay homage to Manuel I Komnenos, who persuaded him to install a Greek Orthodox patriarch in Antioch. The Latin patriarch of Antioch, Aimery of Limoges, placed Antioch under interdict. Bohemond restored Aimery only after the Greek patriarch died during an earthquake in 1170.
The Battle of Inab, also called Battle of Ard al-Hâtim or Fons Muratus, was fought on 29 June 1149, during the Second Crusade. The Zengid army of Atabeg Nur ad-Din Zangi destroyed the combined army of Prince Raymond of Poitiers and the Assassins of Ali ibn-Wafa. The Principality of Antioch was subsequently pillaged and reduced in size as its eastern border was pushed west.
Toron, now Tibnin or Tebnine in southern Lebanon, was a major Crusader castle, built in the Lebanon mountains on the road from Tyre to Damascus. The castle was the centre of the Lordship of Toron, a seigneury within the Kingdom of Jerusalem, actually a rear-vassalage of the Principality of Galilee.
Hugh of Ibelin was an important noble in the Kingdom of Jerusalem and was Lord of Ramla from 1152-1169.
The siege of Damascus took place between 24 and 28 July 1148, during the Second Crusade. It ended in a crusader defeat and led to the disintegration of the crusade. The two main Christian forces that marched to the Holy Land in response to Pope Eugene III and Bernard of Clairvaux's call for the Second Crusade were led by Kings Louis VII of France and Conrad III of Germany. Both faced disastrous marches across Anatolia in the months that followed, with most of their armies being destroyed. The original focus of the crusade was Edessa (Urfa), but in Jerusalem, the preferred target of King Baldwin III and the Knights Templar was Damascus. At the Council of Acre, magnates from France, Germany, and the Kingdom of Jerusalem decided to divert the crusade to Damascus.
The principality of Galilee was one of the four major seigneuries of the crusader Kingdom of Jerusalem, according to 13th-century commentator John of Ibelin, grandson of Balian. The direct holdings of the principality centred around Tiberias, in Galilee proper, but with all its vassals, the lordship covered all Galilee and southern Phoenicia. The independent Lordship of Sidon was located between Galilee's holdings. The principality also had its own vassals: the Lordships of Beirut, Nazareth, and Haifa.
Mu'in ad-Din Unur was a mid-12th century ruler of Damascus from 1140 to 1149. He was a Turkoman slave of Burid emirs.
The siege of Ascalon took place in 1153, resulting in the capture of that Egyptian fortress by the Kingdom of Jerusalem.
The Battle of Harim (Harenc) was fought on 12 August 1164 at Harim, Syria, between the forces of Nur ad-Din, and a combined army from the County of Tripoli, the Principality of Antioch, the Byzantine Empire, and Armenia. Nur ad-Din won a crushing victory, capturing most of the leaders of the opposing army.
Qutb al-Din Mawdud was the Zengid Emir of Mosul from 1149 to 1169. He was the son of Imad al-Din Zengi and brother and successor of Sayf al-Din Ghazi I.
Gilbert of Assailly was the fifth Grand Master of the Knights Hospitaller, serving from 1162 or 1163 to 1170, when he was deposed. As Grand Master, he succeeded Auger de Balben. Nevertheless, most sources list him as the fifth, rather than fourth, Grand Master and this biography continues that tradition, with the exception being Delaville Le Roulx' work. He was succeeded by Gastone de Murols. Gilbert encouraged Amalric of Jerusalem in his unsuccessful invasion of Egypt, leaving the Order in debt and causing the reexamination of its military role.
The Battle of Bosra was a lengthy and ultimately inconclusive battle fought in the spring of 1147 during the Second Crusade, between a Crusader force commanded by King Baldwin III of Jerusalem and Turkish forces from Damascus led by Mu'in ad-Din Unur, who was aided by Nur ad-Din's contingent from Mosul and Aleppo. Irritated by his Damascus overlord, the emir of Bosra and Salkhad invited the Crusaders to occupy the two places. Before the Latin army could take possession of Bosra, the emir's wife allowed a Damascene garrison into the city, and the thwarted Crusaders were forced to retreat via a grueling march through enemy territory. The Turks constantly harassed the retreating Latin column but were unable to inflict a defeat on their enemies.
In the Battle of Aintab in August 1150, a Crusader force commanded by King Baldwin III of Jerusalem repelled the attacks of Nur ad-Din Zangi of Aleppo and evacuated the Latin Christian residents of the County of Edessa. This was both a tactical victory and a strategic defeat for the Crusaders.
The military history of the Crusader states begins with the formation of the County of Edessa in 1097 and ends with the loss of Ruad in 1302, the last Christian stronghold in the Holy Land.
Constantine Kalamanos or Coloman was a Byzantine governor of Cilicia.
In the Battle of al-Buqaia in 1163, the Crusaders and their allies inflicted a rare defeat on Nur ad-Din Zangi, the Emir of Aleppo and Damascus. King Amalric I led the army of the Kingdom of Jerusalem, together with contingents from the northern Latin states, a substantial body of pilgrims who had just arrived from France, and a force brought by the Byzantine governor of Cilicia. For the Christian forces, this victory only gave a brief respite from the sustained Muslim offensive.
In the Battle of Butaiha in July 1158, a Crusader army led by King Baldwin III of Jerusalem won a victory against the forces of Nur ad-Din Zengi, the emir of Aleppo and Damascus on the plains of Butaiha located in the northeast part of modern-day Israel. At the time of the battle, the area belonged to the Kingdom of Jerusalem.
Kingdom of Jerusalem 
Knights Templar