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The Great Frisian War was an armed conflict in the 15th century. For nine years, between 1413 and 1422, there was war in the Seven Friesian countries (Friesland between Vlie and Weser). The war began in East Frisia due to a runaway feud between two major nobles Keno II tom Brok and Hisko Abdena. All major parties in Friesland chose a side and a civil war arose. The war was a mixed success for all parties involved. With the exception of the van Bronckhorsts in the city of Groningen, no party achieved lasting benefits. At the end of the war end of Frisian freedom almost happened as the result of a foreign ruler, John of Bavaria who was asked for help, after power himself to conquer Friesland. However, his Dutch troops were driven out again after a short time. On February 1, 1422 all parties came to Groningen to make peace. Frisian freedom finally ended in 1498.