Green’s Dictionary of Slang

alphonse n.¹

a gigolo.

1909

J. Ware Passing Eng. of the Victorian Era 7/1: Alphonse (Soc., 1870 on). A man of position who accepts money from a married woman or women richer, and probably older, than himself, as recompense for remaining her or their lover. Quite understood in Paris – not known out of society in London. From the play Monsieur Alphonse (Alexandre Dumas, fils).