What is considered the Kingdom of Italy established from 493 to 553?
Ostrogothic Papacy The Ostrogothic Papacy was a period from 493 to 537 where the papacy was strongly influenced by the Ostrogothic Kingdom, if the pope was not outright appointed by the Ostrogothic King. The selection and administration of popes during this period was strongly influenced by Theodoric the Great and his successors Athalaric and Theodahad. This period terminated with Justinian I's (re)conquest of Rome during the Gothic War (535–554), inaugurating the Byzantine Papacy (537-752).
Patriarch of Grado This is a list of the Patriarchs of Grado (north-eastern Italy). The patriarchate came into being when the schismatic Patriarch of Aquileia, Paulinus (557-569), moved to Grado in the mid 6th century. But in their reunion with Rome in 606, a rival office was set up in Old-Aquileia. Aquileia later entered communion with Rome but was able to keep its independence and title from Grado. In 1451 the see of Grado was merged with Castello to form the Roman Catholic Archdiocese of Venice.