means A grand, opulent residence, typically the official home of a monarch, ruler, or other very important person.

from From Latin 'Palatium,' the name of the Palatine Hill in Rome where the emperors built their lavish homes. The hill itself outgrew its geography: 'Palatium' came to mean not just the place but the building, then any building that aspired to such splendor. It passed through Old French 'palais' into English. The same root quietly fathered 'palatial' and, more distantly, the word 'paladin' — so the very name of the hill became a synonym for grandeur everywhere it travelled.