What city did the pope live in during the Middle Ages?

Question: What city did the pope live in during the Middle Ages!?

also, where where castles built during that time!?Www@QuestionHome@Com

Best Answer - Chosen by Asker:

4th C!. - 1309 The Lateran Palace in SE Rome
1309 - 1408 Palais des Papes, Avignon, France (Popes and Anti-Popes)
1376+ Pope moved back to Rome - I can't find the residence!.
1573 - 1871 Quirinal Palace, Rome (originally the Summer home)
1871 - present Apostolic Palace in Vatican CityWww@QuestionHome@Com