cornutor
One who makes another person into a cuckold.
obsolete
Or as the Spaniel who loves his Master the more for beating him, so doth not the Cornutee love the Cornutor the more for cudgelling his wife with his Flabellum […]
Where it comes from
From Italian cornuto, from Latin cornūtus, from cornu. By surface analysis, cornute + -or.
Adapted from the Wiktionary entry cornutor (CC BY-SA 4.0).