Henry Seymour Portman was a Member (MP) for St Mawes and was also commissioner for assessment for Dorset.
Seymour was returned unopposed as Member (MP) for St Mawes in March 1679 and was returned again in elections in October 1679, 1681, 1685 and 1689. He was commissioner for assessment for Dorset from 1689 to 1690. 
