When did William the Conqueror come to England from Normandy? Why

1. In 1066 William the Conqueror came to England from Normandy, he became the king of England. 
2.. The Norman conquest of England began in 1066 AD with the invasion of the Kingdom of England by the troops of William, Duke of Normandy ("William the Conqueror"), and his victory at the Battle of Hastings

The tower's primary function was a fortress, a royal palace, and a prison (particularly for high status and royal prisoners, such as the Princes in the Tower and the future Queen Elizabeth I). This last use has led to the phrase "sent to the Tower" (meaning "imprisoned"). It has also served as a place of execution and torture, an armoury, a treasury, a zoo, the Royal Mint, a public records office, an observatory, and since 1303, the home of the Crown Jewels of the United Kingdom.

1. The Norman conquest of England began in 1066 AD with the invasion of the Kingdom of England by the troops of William, Duke of Normandy ("William the Conqueror"), and his victory at the Battle of Hastings