palaceyoudaoicibaDictYouDict[palace 词源字典]
palace: [13] The Palātium, or Mons Palātīnus (in English the ‘Palatine hill’), was one of the seven hills of ancient Rome. On it the emperor Augustus built a house, which in due course grew into a grand imperial palace, also called the Palātium. This came to be used as a generic term for such residences, and passed into English via Old French paleis. The derived Latin adjective palātīnus has given English paladin [16] and palatine [15].
=> paladin, palatine[palace etymology, palace origin, 英语词源]
palace (n.)youdaoicibaDictYouDict
early 13c., "official residence of an emperor, king, archbishop, etc.," from Old French palais "palace, court," from Medieval Latin palacium "a palace" (source of Spanish palacio, Italian palazzo), from Latin palatium "the Palatine hill," in plural, "a palace," from Mons Palatinus "the Palatine Hill," one of the seven hills of ancient Rome, where Augustus Caesar's house stood (the original "palace"), later the site of the splendid residence built by Nero. In English, the general sense of "splendid dwelling place" is from late 14c.

The hill name probably is ultimately from palus "stake," on the notion of "enclosure." Another guess is that it is from Etruscan and connected with Pales, supposed name of an Italic goddess of shepherds and cattle.