East Frisian-Gueldrian War
Open-knowledge reference entry

The East Frisian-Gueldrian War of 1531–1534, also known as the Gueldrian Feud, was a conflict between Counts Enno II and Johan I of East Frisia on the one hand, and Balthasar von Esens and Duke Charles II of Guelders on the other. In this war, which lasted from 1531 to 1534, East Frisia suffered severe devastation. The war came to an end in 1534 with the Peace of Logum.
Background
The Counts of East Frisia from the House of Cirksena had been having problems with Lord Balthasar von Esens, the Lord of Esens, Stedesdorf and Wittmund, for some time. In 1530, Enno II marched to Esens, defeated Balthasar, and forced him into a humiliating peace. Enno II took away a large part of his former territory, including Wittmund, Westerholt, Ochtersum, Dunum, and Werdum. Balthasar was also forced to accept Enno as his feudal lord and beg on his knees for the signing of a treaty. Balthasar plotted revenge. In 1531, he found help from the Catholic Duke Charles of Guelders, who was not well-disposed towards the Counts of East Frisia because the Reformation had been introduced in East Frisia under Enno's father, Edzard I of East Frisia.
The War
In 1531, Balthasar's troops invaded East Frisia and devastated the country.
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