# Thirteen Years' War begins (1454)

URL: https://poland-history.com/timeline/1454-thirteen-years-war-begins
Location: Prussia
Categories: battle, main-event

The Prussian Confederation rebelled against the Order and asked Casimir IV to incorporate Prussia, triggering a long war. Within the broader Jagiellonian Age period: The union with Lithuania created one of Europe's largest states. Victory over the Teutonic Order, the rise of noble democracy and a brilliant Renaissance culture marked the Jagiellonian golden age. At this point in the timeline (1454), the governing authority was Casimir IV Jagiellon (King of Poland). Won the Thirteen Years' War, regaining Pomerelia and Warmia, and placed his sons on the thrones of Bohemia and Hungary. Thirteen Years' War begins mattered because it changed the military or territorial balance and influenced the political choices that followed. The event is placed here so readers can follow it alongside changes in government, warfare, society, religion and culture across Polish history.

## Why it matters
Thirteen Years' War begins mattered because it changed the military or territorial balance and influenced the political choices that followed.

Ruler at the time: [Casimir IV Jagiellon](https://poland-history.com/rulers/casimir-iv-jagiellon)

## Sources
- [Wikipedia — Thirteen Years' War (1454–1466)](https://en.wikipedia.org/wiki/Thirteen_Years'_War_(1454%E2%80%931466))
- [Encyclopaedia Britannica topic lookup — Thirteen Years' War begins](https://www.britannica.com/search?query=Thirteen+Years%27+War+begins)
- [Wikipedia — Jagiellonian dynasty (period overview)](https://en.wikipedia.org/wiki/Jagiellonian_dynasty)