TheCitadel of Peladon was thecastle that served as the seat for theRoyal House of Peladon. It had been constructed circa3035 (AUDIO:The Bride of Peladon) on the orders ofKingErak. (PROSE:Legacy)

On multiple occasions the Citadel hosted delegates from theGalactic Federation and during the reigns of KingPeladon and his daughter QueenThalira. (TV:The Curse of Peladon,AUDIO:The Poison of Peladon) In Thalira's reign it was briefly occupied by renegadeIce Warriors working forGalaxy 5 who used the pretex of a mining dispute to declare martial law, until they were driven out by combined forces of the royal palace and miners led by theThird Doctor. (TV:The Monster of Peladon)

Erimem, who eventually became a resident of the Citadel as its Queen, found it eerily familiar. TheFifth Doctor explained that it was quite similar toCastle Dracula, (AUDIO:The Bride of Peladon) which Erimem had previously visited. (AUDIO:Son of the Dragon)

During QueenMinaris' reign,Helais led an attack on the Citadel after the Queen refused to take action following a mining collapse. Her forces got as far as the throne room where theSixth Doctor talked her down. (AUDIO:The Death of Peladon)

Arla Decanto was held for three days in the Citadel's prison during ChancellorBarok's regime, with theEighth Doctor visiting her at night via secret tunnels. (AUDIO:The Truth of Peladon)