Simplify the following text for a Grade 4 native English-speaking person.
Original: When Matilda 's father abdicated and retired to a monastery the same year , this was joined with Boulogne and the similarly large English honor Matilda inherited . On Eustace III 's death , Matilda and her husband became joint rulers of Boulogne .
Simplified: Matilda was born in Boulogne , France .