Union of Utrecht
treaty signed in Utrecht, unifying the northern provinces of the Netherlands, until then under the control of Habsburg Spain
The Union of Utrecht (Dutch: Unie van Utrecht) is a treaty signed on January 23, 1579 in Utrecht, the Netherlands, unifying the northern provinces of the Netherlands, until then under control of Spain. The Union of Utrecht is regarded as the foundation of the Republic of the Seven United Netherlands, which was not recognised internationally until the Peace of Westphalia in 1648 ended the Eighty Years' War.
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Map of the Spanish Netherlands, the Union of Utrecht and the Union of Arras (1579)
