Conversation so far:
when was Thomas Aquinas born?
1225.
where was he born?
in the castle of Roccasecca.
are any family members listed?
he was born in the castle of his father.
where did he go to school?
began his early education at Monte Cassino.
who were some of his influences?
Aristotle, Averroes.
what was he like in early life?
At the age of nineteen Thomas resolved to join the recently founded Dominican Order.
what did he do with the dominican order?
Thomas came under the influence of John of St.
Julian, a Dominican preacher in Naples.

Question: what did john do for him?
Self-contained rewrite: What did Dominican preacher, John of St. Julian, do for Thomas Aquinas?