Joan of Bar, Countess of Surrey

On 25 May 1306, Joan was married to one of the leading nobles of England, John de Warenne, 7th Earl of Surrey,[2] a "nasty, brutal man with scarcely one redeeming quality".

[5] She was probably close to her cousin Elizabeth de Clare, who left Joan an image of John the Baptist in her will.

Joan of Bar, Robert's grandaunt, made known to the king that she was ready to replace Yolande and assume the regency.

Yolande initially renounced the regency, but then went back on her decision, levying troops to fight Joan.

When John II of France was captured and imprisoned in London, she was allowed to visit him, and is said to have become his mistress.