John II of Avesnes: The Union of …

Years: 1300 - 1300

John II of Avesnes: The Union of Hainaut and Holland and the Defeat of Flanders (1299–1301)

John II of Avesnes (b. 1247) was the eldest son of John I of Avesnes and Adelaide of Holland, the daughter of Floris IV, Count of Holland. His inheritance and strategic alliances shaped the political landscape of the Low Countries in the late 13th and early 14th centuries.

The Personal Union of Hainaut and Holland (1299–1356)

  • John became Count of Hainaut in 1280 upon the death of his father.
  • In 1299, following the murder of his cousin, Floris V of Holland, John inherited Holland and Zeeland through his mother, Adelaide of Holland, who had acted as heiress and regent of the county.
  • This created a personal union between Hainaut and Holland–Zeeland, which would endure for over half a century, strengthening the Avesnes family’s influence in the region.

The Ongoing War Against Flanders

  • John II continued the long-running war between the House of Avesnes and the House of Dampierre, contesting imperial Flanders against Count Guy of Flanders.
  • His cousin, Floris V of Holland, had also fought against Flanders for control of Zeeland, even seeking French support against Guy of Dampierre.
  • After Floris V’s assassination in 1296, John II took up his cause, reinforcing Holland’s claims against Flanders.

Victory Over Flanders (1300–1301)

  • In 1300–1301, French forces defeated the Flemish in a decisive campaign, strengthening John II’s position.
  • The Flemish rebels in Zeeland were also crushed, securing Holland’s authority over the disputed region.
  • His brother, Guy of Avesnes, was appointed Bishop of Utrecht, further consolidating Avesnes control over the Low Countries.

John II’s Triumph

By 1301, John II had eliminated his main rivals:

  • Floris V’s murderers were defeated.
  • The House of Dampierre suffered major setbacks.
  • Flemish resistance in Zeeland was broken.

With Flanders temporarily subdued and Holland and Zeeland firmly under his rule, John II solidified the Avesnes dynasty’s power, laying the foundation for the continued dominance of his family in the Low Countries.

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