HMS Victory is a 104-gun first-rate ship of the line of the Royal Navy. She was ordered in 1758, laid down in 1759, and launched in 1765. With years of service as of , she is the world's oldest naval vessel still in commission. Victory is best known for her role as Lord Nelson's flagship at the Battle of Trafalgar on 21 October 1805. She additionally served as Keppel's flagship at Ushant, Howe's flagship at Cape Spartel and Jervis's flagship at Cape St Vincent. After 1824, she was relegated to the role of harbour ship. In 1922, she was moved to a dry dock at Portsmouth, England, and preserved as a museum ship. She has been the flagship of the First Sea Lord since October 2012. In December 1758, William Pitt the Elder, in his role as head of the British government, placed an order for the building of 12 ships, including a first-rate ship that would become Victory. During the 18th century, Victory was one of ten first-rate ships to be constructed. The outline plans were based on which had been launched at Woolwich Dockyard in 1756, and the naval architect chosen to design the ship was Sir Thomas Slade who, at the time, was the Surveyor of the Navy. She was designed to carry at least 100 guns. The commissioner of Chatham Dockyard was instructed to prepare a dry dock for the construction. The Master Shipwright in charge of construction was Edward Allin, son of Sir Joseph Allin, former Surveyor of the Navy. The keel was laid on 23 July 1759 in the Old Single Dock (since renamed No. 2 Dock and now Victory Dock), and a name, Victory, was chosen in October 1760. In 1759, the Seven Years' War was going well for Britain; land victories had been won at Quebec and Minden and naval battles had been won at Lagos and Quiberon Bay. It was the Annus Mirabilis, or Wonderful Year, and the ship's name may have been chosen to commemorate the victories or it may have been chosen simply because out of the seven names shortlisted, Victory was the only one not in use. There were some doubts whether this was a suitable name since the previous had been lost with all hands in 1744.