The Treaty of Nonsuch was signed on 10 August 1585 by Elizabeth I of England and the Dutch rebels fighting against Spanish rule.
Elizabeth I agreed to supply 6,400 foot soldiers and 1,000 cavalry (who were to be led by Robert Dudley, the 1st Earl of Leicester) which were initially intended as a way of lifting the siege of Antwerp, with an annual subsidy of 600,000 florins, about a quarter of the annual cost of the revolt.
As a surety for this assistance, the Dutch were to hand over Brill and Flushing to England, which it would garrison at its own expense.
[1] The treaty granted Elizabeth the right to appoint two councillors to the Council of State of the United Provinces.
Three years later, he launched the Spanish Armada and attempted to invade and conquer England.