He appears as a prothonotary in a document of February, 1491, and at the same time the youngest of Rodrigo's sons, Giuffre, a boy of about nine years, was made Canon and Archdeacon of Valencia.
Caesar went to Pisa, probably in 1491.

Its university attracted a great many of the sons of the prominent Italian families, chiefly on account of the fame of its professor of jurisprudence, Philippo Decio of Milan.
At the university the young Borgia had two Spanish companions, who were favorites of his father, Francesco Romolini of Ilerda and Juan Vera of Arcilla in the kingdom of Valencia.

The latter was master of his household, as Caesar himself states in a letter written in October, 1492, in which he also calls Romolini his "most faithful comrade."[15] Francesco Romolini was more than thirty years of age in 1491.

He was a diligent student of law, and became deeply learned in it.

He is the same Romolini who afterwards conducted the prosecution of Savonarola in Florence.