Born the third son of Admiral Sir Michael Seymour; 1st Baronet; Michael Seymour entered the Royal Navy in 1813. He was made Lieutenant in 1822; Commander in 1824 and was posted Captain in 1826. From 1833 to 1835 he was captain of the survey ship HMS Challenger; and was wrecked in her off the coast of Chile. In 1841 he was given command of HMS Britannia and then of HMS Powerful. In 1845 he took over HMS Vindictive.

From 1851 to 1854 he was Commodore Superintendent of Devonport Dockyard. In 1854 he served under Sir Charles Napier in the Baltic during the Crimean War. He was promoted to Rear-Admiral that same year and; when the Baltic campaign was resumed in 1855 under Admiral the Hon. Richard Dundas; Seymour was second in command.

On 19 February 1856 he was appointed commander-in-chief of the East Indies and China Station. Flying his flag on HMS Calcutta; he conducted operations arising from the attack on the British Coaster Arrow; helped destroy the Chinese fleet in June 1857; took Canton in December; and in 1858 he captured the forts on the Baihe (Hai River); compelling the Chinese government to consent to the Treaties of Tianjin.

He was made GCB in 1859. He sat as a Liberal Member of Parliament for Devonport from 1859 to 1863. In 1863 he was made Commander-in-Chief; Portsmouth; a post he held until 1866. He retired in 1870 Pictures From History