negotiations between Spain and Portugal which resulted in the Treaty of Lisbon. Like all Ambassadors of the era, he found the cost of running an embassy ruinous (he had never had a good head for business) and on his return to England in the autumn of 1668 one of his first actions was to borrow money from his cousin Samuel Pepys. On his way back from Spain, he again visited Tangier to report on the condition of the garrison there. In 1670 he escorted the King's sister Henrietta of England, Duchess of Orleans, from France to England to negotiate the Secret Treaty of Dover between her brother and Louis XIV. Of the existence of the Treaty's secret clauses, notably that by which Charles II pledged to convert to the Roman Catholic faith, Sandwich, like the general public, was quite unaware. In the same year he was appointed President of the Privy Council Committee on Foreign Plantations; he had always had a keen interest in international trade, despite his notorious inability to keep his own finances in order. Last campaign and death He was subsequently reappointed to a naval command, and by 1672 at the start of the Third Anglo-Dutch War, he was Vice-Admiral of the Blue with the Royal James as his flagship. At the Battle of Solebay on 28 May, his ship was attacked by a group of fire ships and was destroyed with the loss of many lives, including Sandwich himself. His body was washed ashore a week later, recognisable only from his clothing; it was unmarked and he appeared to have drowned. Sandwich opposed the war and is said to have predicted his own death. Certainly, he told his friend John Evelyn, just before he sailed, that "he would see him no more". On Wednesday 3 July 1672 he was buried in Westminster Abbey after a state funeral that started with a procession along the River Thames of five decorated barges from Deptford. The body was landed at Westminster at about 5 pm and carried to the Abbey in a grand procession. Sandwich and Samuel Pepys Sandwich on his mother's side was the first cousin of John Pepys, the father of Samuel Pepys. Pepys started his career as a minor member of the Sandwich household and owed his appointments first to the Wardrobe and then as Clerk of the Acts to the Navy Board to Sandwich's influence.