Coronations
Since the coronations in 1066 of both King Harold and William the Conqueror, coronations of English and British monarchs were held in the Abbey. Henry III was unable to be crowned in London when he first came to the throne because the French prince Louis had taken control of the city, and so the king was crowned in Gloucester Cathedral. However, this coronation was deemed by the Pope to be improper, and a further coronation was held in the Abbey on 17 May 1220. The Archbishop of Canterbury is the traditional cleric in the coronation ceremony.
King Edward's Chair (or St Edward's Chair), the throne on which English and British sovereigns have been seated at the moment of coronation, is housed within the Abbey and has been used at every coronation since 1308. From 1301 to 1996 (except for a short time in 1950 when it was temporarily stolen by Scottish nationalists), the chair also housed the Stone of Scone upon which the kings of Scots are crowned. Although the Stone is now kept in Scotland, in Edinburgh Castle, at future coronations it is intended that the Stone will be returned to St Edward's Chair for use during the coronation ceremony.
Read more about this topic: Westminster Abbey