potentiary
nounEtymology Has similar roots to potential; potent + -ary, with the addition of an i.
1
Archaic A person invested with power or influence.
- […] Tween Then Woon, a man of sense and prudence, after having been vested with the powers of a potentiary, has been ordered to proceed with a royal letter and presents.1833, The Asiatic journal and monthly register: