The question just came to me: Who is this man? In Miketz 41:45 Wee see Yosef given to marry Osnat the daughter of Poti Phera the priest of On. In the earlier reference to Potiphar in Parshat Va'Yeishev in 39:1, Potiphar is referenced as a minister of Pharoah, the Chief Chef (Sar Hatabachim).
Is this the same man?
According to Rashi it seems to be. Rashi brings a midrash that says Yosef saw with Ruah Hakodesh he would have children from Potiphar. So when he married Osnat daughter of Poti Phera, that would imply it is the same person.
Is it the same man? Did Potiphar receive a promotion to priest of On? Were they two different people? Was it the same man? Why was he referenced as a minister and chief steward/btcher/chef earlier and later as a priest?