ἀντιχρηματίζομαι
From LSJ
Dante Alighieri, Paradiso, XXXIII, v. 145
English (LSJ)
transact business instead of another, PFlor.382.59 (iii A.D.).
Spanish (DGE)
actuar en nombre de otro, representar, PMich.529ue.49 (III d.C.), cf. PFlor.382.59 (III d.C.).