Paulinus I was the first Patriarch of Aquileia

Patriarch of Aquileia

The Patriarch of Aquileia was an office in the Roman Catholic Church. During the Middle Ages the Patriarchate of Aquileia was a temporal state in Northern Italy. The Patriarchate of Aquileia as a church office was suppressed in 1752....

 from 557 to 571.

When he took over the see was in schism with Rome

Schism of the Three Chapters

The Schism of the Three Chapters was a schism that affected the Roman Catholic Church in North Italy lasting from 553 to 698 AD, although the area out of communion with Rome contracted throughout that time...

. When the Lombards

Lombards

The Lombards , also referred to as Longobards, were a Germanic tribe of Scandinavian origin, who from 568 to 774 ruled a Kingdom in Italy...

 invaded northern Italy in 569, Paulinus fled Aquileia

Aquileia

Aquileia is an ancient Roman city in what is now Italy, at the head of the Adriatic at the edge of the lagoons, about 10 km from the sea, on the river Natiso , the course of which has changed somewhat since Roman times...

 with his treasures, as had the other Archibishop in schism with Rome, Honoratus of Milan. Paulinus transferred his see to Grado

Grado, Italy

Grado is a town and comune in the north-eastern Italian region of Friuli-Venezia Giulia, located on a peninsula of the Adriatic Sea between Venice and Trieste....

, a small island opposite Aquileia, which was still controlled by the Byzantines

Byzantine Empire

The Byzantine Empire was the Eastern Roman Empire during the periods of Late Antiquity and the Middle Ages, centred on the capital of Constantinople. Known simply as the Roman Empire or Romania to its inhabitants and neighbours, the Empire was the direct continuation of the Ancient Roman State...

, but retained the title of Patriarch of Aquileia. He died soon after arriving in Grado.