"Dedicated to Ra; i.e., to the sun-god, the Egyptian to whom the" "Ishmaelites sold Joseph (Gen. 39:1). He was "captain of the" "guard", i.e., chief, probably, of the state police, who, while" "they formed part of the Egyptian army, were also largely" "employed in civil duties (37:36; marg., "chief of the" "executioners"). Joseph, though a foreigner, gradually gained his" "confidence, and became overseer over all his possessions." Believing the false accusation which his profligate wife brought "against Joseph, Potiphar cast him into prison, where he remained" for some years. (See [503]JOSEPH.)

See where Potiphar occurs in the Bible...

Definition of Potiphar:
"bull of Africa; a fat bull"