Ferdinand I of Aragon vs Jacqueline of Hainaut

Ferdinand I was elected King of Aragon by the Compromise of Caspe, a commission of nine representatives from Aragon, Catalonia, and Valencia. This resolved the succession crisis following the death of Martin I without a direct heir, bringing the Trastamara dynasty to the Aragonese throne.

Ferdinand I launched a military campaign to subdue the rebellious Sardinian nobles who had resisted Aragonese rule. The campaign successfully reasserted Aragonese control over the island, consolidating the Crown of Aragon's Mediterranean possessions.

Ferdinand I implemented administrative reforms in the Crown of Aragon, including the reorganization of the royal council and the standardization of tax collection. These reforms strengthened royal authority and improved the efficiency of governance across the diverse territories of Aragon.

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.