Union of Utrecht

Union of Utrecht, anti-Spanish alliance formed by a treaty between all of the northern and some of the southern Low Countries in 1579. The northern part of the Low Countries eventually became the Netherlands, while the southern part became Belgium.

For information on:

• treaty and its effects, see Netherlands: The Struggle for Independence
• federation created by the Union of Utrecht compared with similar entities, see Federal Government
• leader of the alliance created by the Union of Utrecht, see William I (of Orange)
• regions joining the Union of Utrecht, see Friesland; Frisia
• promoter of the Union of Utrecht, see Jan van Olden Barneveldt