Cujus est dare ejus est disponere
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
Who has the gift of anything should have the disposition of it. Cujus est divisio alterius est electio. Whichever one has the division, the other has the choice.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Wing. Max. 53. Whose it is to give, his it is to dispose; or, as Broom says, "the be-stower of a gift has a right to regulate its disposui." Broom, Max. 459, 461, 463, 464.