He used his linguistic ability to translate Isocrates' Ad demonicum from Greek into Latin, Italian, French and English when he was young.
In 1607, although he was still only seventeen years old, he was appointed as a Fellow of All Souls when the minimum age was eighteen.
[1] Although Gentilis obtained his Bachelor of Civil Law degree in 1612, his behaviour had changed before his father's death in 1608.
He was described by Anthony Wood as having "turned a rake-hell" and become "king of the beggars for a time", "given up to sordid liberty, if not downright wickedness.
He wrote further dedications for his father's books, which were addressed to King James I and to three heads of colleges at Oxford.