The son of Angelo Correr, a senator of Venice, Pietro first appears in the historical record in 1265 as pieve to the church of Sant'Aponal.
Correr looked like winning it but eventually in 1274 pope Gregory X invalidated the election and unilaterally made Querini bishop.
[1] In 1274 he acquired some funds from Aldinello of Bassano and the following year he attacked Alidnello's son Pietro.
Correr's election was confirmed by Pope Honorius IV and he was consecrated by Latino Malabranca Orsini, bishop of Ostia.
Some sources name him Archbishop of Candia but this is an error, possibly arising from Pope Boniface VIII's union of that diocese with the patriarchate in 1302, which occurred after Correr's death.