Simplify the following text for a Grade 8 native English-speaking person.
Original: Anne , Duchess of Brittany ( 25 January 1477 -- 9 January 1514 ) , also known as Anna of Brittany , was a Breton ruler , who was to become queen to two successive French kings .
Simplified: Anne of Brittany ( January 25 , 1477 - January 9 , 1514 ) was a Duchess of Brittany .