alternatehistory.com

Marie was left as regent for Champagne when Henry I went on pilgrimage to the Holy Land from 1179 until 1181. While her husband was away, Marie's father died and her half-brother, Philip, became king. He confiscated his mother's dower lands and married Isabelle of Hainaut, who was previously betrothed to Marie's eldest son. This prompted Marie to join a party of disgruntled nobles—including Queen Adele and the archbishop of Reims—in plotting against Philip. Eventually, relations between Marie and her royal brother improved. Her husband died soon after his return from the Holy Land. Now a widow with four young children, Marie considered marrying Philip of Flanders, but the engagement was broken off suddenly for unknown reasons. Marie resumed regency when her son also went on Crusade, governing Champagne from 1190 to Henry's death in 1197.
https://en.wikipedia.org/wiki/Marie_of_France,_Countess_of_Champagne

That would make a great alliance
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