He was the author of a work printed in Rome in September, 1493, under the title _Commentarius Porcius_, which was dedicated to the King and Queen of Spain.

In it he describes the election and coronation of Alexander VI, and quotes portions of the declarations of loyalty which the Italian envoys addressed to the Pope.

Court flattery could not be carried further than it was in this case by Hieronymus, an affected pedant, an empty-headed braggart, a fanatical papist.

Alexander made him Bishop of Andria and Governor of the Romagna.

In 1497 Hieronymus, then in Cesena, composed a dialogue on Savonarola and his "heresy concerning the power of the Pope." The kernel of the whole thing was the fundamental doctrine of the infallibilists; namely, that only those who blindly obey the Pope are good Christians.[70] Porcius also essayed poetry, celebrating the magnificence of the Pope and Cardinal Caesar, whom, in his verses on the Borgia Steer, he described as his greatest benefactor.