"Sir John Lockhart-Ross, 6th Baronet (11 November 1721 – 9 June 1790), known as John Lockhart from 1721 to 1760, was an officer of the Royal Navy who saw service during the War of the Austrian Succession, Seven Years' War, and the American War of Independence, and served for a time as a Member of Parliament.
Lockhart was born into a gentry family in 1721 and embarked on a naval career. He served on a number of ships during the War of the Austrian Succession, seeing action at both the First and Second Battles of Cape Finisterre, having by then risen to the rank of lieutenant. He had his own commands by the outbreak of the Seven Years' War, and enjoyed particular success as a frigate captain, cruising against privateers while in command of HMS Tartar. Further commands followed, including roles in detached squadrons at the Battle of Quiberon Bay. Taking the additional name Ross after he inherited a deceased relative's estates, he served as a member of parliament and undertook land reforms and improvements during the years of peace before the outbreak of the American War of Independence." - (Wikipedia (en) 31.10.2019)