Sub potestate
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
Under the protection.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Under, or subject to, the power of another; used of a wife, child, slave, or other person not sui juris.
Defined under Sub in Black's Law Dictionary.