A palace was a residence for royalty.
Gilgamesh lived in the palace of Uruk, while Agga lived in the palace of Kish. (PROSE: Timewyrm: Genesys)
Priam lived in the palace of Troy. (TV: The Myth Makers)
Sonning Palace was a bishop's palace on the bank of the River Thames. Queen Isabella was imprisoned there after her husband King Richard II was deposed in 1399. (AUDIO: The Doctor's Tale)
The Citadel of Peladon was the palace that served as the seat for the Royal House of Peladon. The Doctor visited it on every occasion that he was on Peladon. (TV: The Curse of Peladon, The Monster of Peladon)
The Treaty of Versailles was signed at the Palace of Versailles in 1919. (PROSE: Illegal Alien)
Buckingham Palace was the London home and primary residence of the British monarchy. In 1889, Li H'sen Chang was scheduled to perform for Queen Victoria at Buckingham Palace but he was killed one month earlier. (TV: The Talons of Weng-Chiang) The palace was destroyed in the 2150s Dalek invasion of Earth. (PROSE: Legacy of the Daleks)
The Doctor once visited a "shopping palace" on the swamps of Dargeb IV. (PROSE: Autonomy)