The commonwealth ended in when was invited back to england as king.

The Commonwealth ended in 1660 when Charles II was invited back to England as King.

Explanation:

The Commonwealth was established in 1649, after King Charles I of England was beheaded on January 30. This was also the end of the English Civil War. On May 19 that year, the Parliament adopted "An Act declaring England to be a Commonwealth".

The Commonwealth was taken over in 1653 by Oliver Cromwell, who designated himself as "Lord Protector" and took over the absolute power over the Commonwealth.  

Cromwell died in 1658 and his son Richard Cromwell succeeded him. He reigned for eight months and at the request of the army he gave them the power. In the first week of May the officers of the army decided to reinstall the Rump Parliament. Later, by a majority, kingship was seen as the most suitable form of state, and therefore Charles II of England was invited to return. This meant the end of the Commonwealth.