1 Kings 11:19

And Hadad found great favour in the sight of Pharaoh
Perhaps for his comely personage, princely qualities, and good behaviour, as he grew up:

so that he gave him to wife the sister of his own wife, the sister of
Tahpenes the queen;
it seems the kings of Egypt used to marry their favourites to great personages; see ( Genesis 41:45 ) .