Admiral Thomas Cochrane, 10th Earl of Dundonald, GCB, 1st Marquess of Maranhão. The 10th Earl only inherited the title in 1831 and was known most of his life by the courtesy title "Lord (Baron) Cochrane". He was a noted naval commander and fought in the Napoleonic Wars. His exploits were the basis of such fictional characters as Horatio Hornblower and Jack Aubrey.