Meaning

noun any of various important officials in ancient Rome

noun (Middle Ages) the lord of a palatinate who exercised sovereign powers over his lands

noun the most important of the Seven Hills of Rome; supposedly the location of the first settlement and the site of many imperial palaces

originFrom late Middle English palatyne, from Old French palatin, from Medieval Latin palātīnus (“relating to the palace”), from palātium (“palace”) + -īnus (“-ine”, adjectival suffix). Doublet of paladin.

Etymology from Wiktionary, CC BY-SA 3.0