[1] Mansel won the Welsh seat of Cardiff as a Tory MP in the 1689 Parliamentary election.

[2] On the death of his father on 17 November 1706, he succeeded to the baronetcy and inherited a life interest in the Briton Ferry estate.

[4] From 1712 to 1714, he was Teller of the Exchequer[5] and from 1714 to 1715 he was Vice-Admiral of South Wales and Governor of Milford Haven.

Mansel reduced his participation in politics in 1715, with a proxy attending Parliament in his stead.

Known for his amorous exploits, Mansel had three illegitimate children by Mrs. Catherine Thomas of Margam at Penrice Castle.