The Roman Catholic Suburbicarian Diocese of Ostia is an ecclesiastical territory located within the Metropolitan City of Rome in Italy. It is one of the seven suburbicarian dioceses. The incumbent Bishop is cardinal Giovanni Battista Re. Since 1150, its bishop has been the Dean of the College of Cardinals,  Its Cathedral is Basilica di Sant'Aurea.
From 1105 to 1914, the diocese was merged with the Suburbicarian Diocese of Velletri. In 1962, the Diocese of Ostia was brought under the direct administration of the Diocese of Rome.
The seven suburbicarian dioceses are Roman Catholic dioceses located in the vicinity of Rome, whose (titular) bishops are the ordinary members of the highest-ranking order of cardinals, the cardinal bishops. Pope Francis has, in addition, co-opted five cardinals of the Latin Church to join the ranks of the Cardinal-Bishops.
The dean of the College of Cardinals presides over the College of Cardinals in the Roman Catholic Church, serving as primus inter pares. The position was established in the 12th century. He always holds the rank of a cardinal bishop, and is assisted by a vice-dean. Both are elected by and from the cardinal bishops who are not Eastern Catholic patriarchs, with their election subject to papal confirmation. Except for presiding over the college, the dean and vice-dean have no power over the other cardinals. In the order of precedence in the Catholic Church, the dean and vice-dean, as the two most senior cardinals, are placed second and third, respectively, after the pope.
The Diocese of Albano is a suburbicarian see of the Roman Catholic Church in a diocese in Italy, comprising seven towns in the Province of Rome. Albano Laziale is situated some 15 kilometers from Rome, on the Appian Way.
The Roman Catholic Suburbicarian Diocese of Palestrina is a Roman Catholic suburbicarian diocese centered on the comune of Palestrina in Italy.
The Diocese of Porto–Santa Rufina is a suburbicarian diocese of the Diocese of Rome and a diocese of the Catholic Church in Italy. It was formed from the union of two dioceses. The diocese of Santa Rufina was also formerly known as Silva Candida.
The Diocese of Frascati is a suburbicarian see of the Holy Roman Church and a diocese of the Catholic Church in Italy, based at Frascati, near Rome. The bishop of Frascati is a Cardinal Bishop; from the Latin name of the area, the bishop has also been called Bishop of Tusculum. Tusculum was destroyed in 1191. The bishopric moved from Tusculum to Frascati, a nearby town which is first mentioned in the pontificate of Pope Leo IV. Until 1962, the Cardinal-Bishop was concurrently the diocesan bishop of the see in addition to any curial duties he possessed. Pope John XXIII removed the Cardinal Bishops from any actual responsibility in their suburbicarian dioceses, and made the title purely honorific.
The Roman Catholic Suburbicarian Diocese of Velletri–Segni is one of the suburbicarian dioceses, Catholic dioceses in Italy close to Rome with a special status and a cardinal bishop, the bishop of Velletri–Segni. Historically, the see of Velletri was combined with the see of Ostia from 1060 to 1914.
Giovanni Antonio Sangiorgio was an Italian canon lawyer and Cardinal. Agostino Oldoino calls him the leading jurisconsult of his age. Kenneth Pennington has called him one of the ‘last two great commentators on feudal law’.
Francesco Pisani was an Italian Cardinal, born in Venice, the son of Alvise Pisani the noted banker, who was Procurator of S. Mark's, a member of the Council of Ten, and a Councilor of the Doge of Venice; and Cecilia Giustinian. He had a brother named Giovanni (Zuan), who also became Procurator of S. Marks' and was a Venetian diplomat; he was married to the sister of Doge Andrea Gritti. He was a strong supporter of the alliance between Venice, France and the Papacy, called the League of Cognac. He shared the imprisonment of Pope Clement VII in the Castel S. Angelo during the Sack of Rome and its aftermath. He spent eighteen months in exile in Naples while Clement made his peace with the Emperor Charles V.
The Italian Catholic diocese of Todi existed until 1986, when it was united into the diocese of Orvieto-Todi. Up until that point, the diocese had always been directly dependent on the Holy See.
The Diocese of Viterbo is a Latin Church ecclesiastical territory or diocese of the Catholic Church in central Italy. From the 12th century, the official name of the diocese was the Diocese of Viterbo e Tuscania. In 1986, several dioceses were combined, and the title was changed to "Diocese of Viterbo, Acquapendente, Bagnoregio, Montefiascone, Tuscania and San Martino al Monte Cimino"; in 1991 the name was shortened to "Diocese of Viterbo".
The Diocese of Tivoli is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Latium, Italy, which has existed since the 2nd century. In 2002 territory was added to it from the Territorial Abbey of Subiaco. The diocese is immediately exempt to the Holy See.
Pope Clement IX created 12 cardinals in three consistories:
Pope Alexander VI created 43 new cardinals in 9 consistories:
Pope Leo X created 42 new cardinals in eight consistories.
Pope Sixtus V created 33 new cardinals in eight consistories:
Pope Clement VII created 32 new cardinals:
Pope Pius IV created 46 cardinals in four consistories:
Pope Paul II created ten cardinals in two consistories.
Pope Eugene IV (1431–1447) created 27 cardinals in six consistories.