Antonius [Antoine] Barbet {Clement VII}
Earliest reference, receipt list of [ 1525 - 1526 ]; receipt list of December 1526 ; had died in Rome by 28 April 1528 (the earliest date of a request for a benefice made vacant by his death--RL 1503, fols. 123v-125r).
He would not appear to be the composer Antonius Barbe, whose music is published in the 1540s.