Instruction of 12 April 1588 in the context of Advocatus

The Republic of the Seven United Netherlands (Dutch: Republiek der Zeven Verenigde Nederlanden), also known as the United Provinces (of the Netherlands), and referred to in historiography as the Dutch Republic, was a confederation and great power that existed from 1588 until the Batavian Revolution in 1795. It was a predecessor state of the present-day Netherlands and the first independent Dutch nation state. The republic was established after seven Dutch provinces in the Spanish Netherlands revolted against Spanish rule, forming a mutual alliance against Spain in 1579 (the Union of Utrecht) and declaring their independence in 1581 (the Act of Abjuration), after which they confederated in 1588 (the Instruction of 12 April 1588) after the States General could not agree on a new monarch. The seven provinces it comprised were Groningen (present-day Groningen), Frisia (present-day Friesland), Overijssel (present-day Overijssel), Guelders (present-day Gelderland), Utrecht (present-day Utrecht), Holland (present-day North Holland and South Holland), and Zeeland (present-day Zeeland).

Although the state was small and had only around 1.5 million inhabitants, it controlled a worldwide network of seafaring trade routes. Through its trading companies, the Dutch East India Company (VOC) and the Dutch West India Company (GWC), it established a Dutch colonial empire. The income from this trade allowed the Dutch Republic to compete militarily against much larger countries. Major conflicts were fought in the Eighty Years' War against Spain (from the foundation of the Dutch Republic until 1648), the Dutch–Portuguese War (1598–1663), four Anglo-Dutch Wars (1652–1654, 1665–1667, 1672–1674, and 1780–1784), the Franco-Dutch War (1672–1678), War of the Grand Alliance (1688–1697), the War of the Spanish Succession (1702–1713), the War of Austrian Succession (1744–1748), and the War of the First Coalition (1792–1795) against the Kingdom of France.

The years 1579–1588 constituted a phase of the Eighty Years' War (c. 1568–1648) between the Spanish Empire and the United Provinces in revolt after most of them concluded the Union of Utrecht on 23 January 1579, and proceeded to carve the independent Dutch Republic out of the Habsburg Netherlands. It followed the 1576–1579 period, in which a temporary alliance of 16 out of the Seventeen Provinces' States–General established the Pacification of Ghent (8 November 1576) as a joint Catholic–Protestant rebellion against the Spanish government, but internal conflicts as well as military and diplomatic successes of the Spanish Governors-General Don Juan of Austria and Alexander Farnese, Duke of Parma split them apart, finally leading the Malcontent County of Artois, County of Hainaut and city of Douai to sign the Union of Arras on 6 January 1579, reverting to Catholicism and loyalty to the Spanish crown.

In response, most of the remaining rebel provinces and cities would forge or later accede to the Union of Utrecht, a closer military alliance treaty that would go on to become the most important fundamental law of the United Provinces, who on 26 July 1581 proclaimed the Act of Abjuration, a de facto declaration of independence from Spain. While the nascent polity was struggling to find a new sovereign head of state, including Matthias of Austria, Francis of Anjou, William "the Silent" of Orange and Robert of Leicester, before giving up and deciding to become the Dutch Republic by the instruction of 12 April 1588, the Duke of Parma continued his successful military and diplomatic offensive, bringing ever more provinces and cities in the southern, eastern and northeastern parts of the Netherlands back into royalist hands.