Al-Mustain vs Jacqueline of Hainaut

Al-Mustain was installed as caliph by the Turkish guard after the death of al-Muntasir. He was a puppet ruler, with real power held by the Turkish military commanders, marking the height of Turkish domination.

Al-Mustain faced a rebellion from his cousin al-Mutazz, who was supported by Turkish factions. The civil war led to the siege of Baghdad and ended with al-Mustain's abdication in 866.

Al-Mustain abdicated the caliphate in favor of al-Mutazz after being defeated. Despite promises of safety, he was executed shortly after, demonstrating the brutality of the Turkish-dominated politics.

Upon the death of her father, William II of Bavaria, Jacqueline inherited the counties of Holland, Zeeland, and Hainaut. As a female ruler, her succession was contested by her uncle John of Bavaria, initiating the Hook and Cod wars.

Jacqueline married John IV of Brabant to secure an alliance against her uncle John of Bavaria. The marriage proved politically disastrous as John IV proved weak and later abandoned her claims, leading to further conflict.

After her marriage to John IV collapsed, Jacqueline fled to England and married Humphrey, Duke of Gloucester, a brother of King Henry V. This alliance brought English military support to her cause in the Low Countries.

Jacqueline was captured by forces of Philip the Good, Duke of Burgundy, who had taken over the war against her. She was imprisoned in Ghent, effectively ending her ability to rule independently.

Under duress, Jacqueline signed the Treaty of Delft, recognizing Philip the Good as regent of her lands. She retained the title of Countess but lost all effective power, marking the end of Wittelsbach rule in Holland and Hainaut.