Brussels, and this necessitated his taking the degree of M.A. in that year by proxy. He remained at Brussels until August 1782, when he was despatched to Paris by Lord Shelburne as plenipotentiary to negotiate a peace with the crowns of France and Spain, and with the States General of the United Provinces; and on 20 January 1783 the preliminaries of peace with the first two powers were duly signed. The peace with the American colonies, which was agreed to at about the same date, was not brought to a conclusion under Fitzherbert's charge, but he claimed to have taken a leading share in the previous negotiations which rendered it possible. This successful diplomacy led to his promotion in the summer of 1783 to the post of envoy extraordinary to the Empress Catherine of Russia, and he accompanied her in her tour round the Crimea in 1787. Spain When differences broke out between Great Britain and Spain respecting the right of British subjects to trade at Nootka Sound and to carry on the southern whale fishery, he was despatched to Madrid (May 1791) as ambassador extraordinary, and under his care all disputes were settled in the succeeding October, for which services he was raised to the Irish peerage with the title of Baron St. Helens. In the following year, Commander George Vancouver and the officers of HMS Discovery made the Europeans' first recorded sighting of Mount St. Helens on 19 May 1792, while surveying the northern Pacific Ocean coast. Vancouver named the mountain after the newly created Baron on 20 October 1792, as it came into view when the Discovery passed into the mouth of the Columbia River. A treaty of alliance between Great Britain and Spain was concluded by him in 1793, but as the climate of that country did not agree with his health he returned home early in 1794. Very shortly after his landing in England, St. Helens was appointed to the ambassadorship at the Hague (25 March 1794), where he remained until the French conquered the country, when the danger of his situation caused much anxiety to his friends. A year or two later a great misfortune happened to him. On 16 July 1797 his house, containing everything he possessed, was burnt to the ground, and he himself narrowly escaped a premature death. He has lost, 'wrote Lord Minto, "every scrap of paper he ever had.