The first King of England was crowned in 927 when the Saxon kingdom of Wessex - previously led by Alfred the Great who had proclaimed himself King of the Anglo-Saxons - finally conquered Northumbria.
In 1603 the union of the crowns occured although it wasn't untill 1707 when England underwent legislative union with Scotland and the Kingdom of Great Britain was created.
Excluded are Monarchs who were only proclaimed but never crowned, Matilda (1141), Louis (1216-1217), Jane (1553). Also excluded is the boy King Henry who was crowned as co-King with his Father but died before his fathers reign ended.