Isabelle de Rethel was a noblewoman from the 12th century, known for her connections to the {House of Rethel} in France. She was the daughter of {Hugh II of Rethel} and played a significant role in the political landscape of her time through her marriage alliances. She married {Baldwin IV of Jerusalem}, becoming Queen of Jerusalem. Her marriage helped strengthen ties between the {Crusader states} and European nobility. Isabelle's life reflects the complexities of medieval politics, where marriages were often used to secure power and influence.