Simplify the following text for a Grade 5 native English-speaking person.
Original: Francis I of France ( September 12 , 1494 - March 31 , 1547 ) was a King of France and a member of the house of Valois .
Simplified: Francis I ( 12 September 1494 â `` 31 March 1547 ) was King of France from 1515 until his death .