Background
The fifth son of Eyre Massey, 3rd Baron Clarina and his wife Susan Elizabeth née Burton, he was originally known as William Frederick Barton Massey.
Member of Parliament in the United Kingdom
The fifth son of Eyre Massey, 3rd Baron Clarina and his wife Susan Elizabeth née Burton, he was originally known as William Frederick Barton Massey.
Trinity College.
Educated at Trinity College Dublin, he was called to the bar at the Inner Temple, London. He assumed the surname Massey-Mainwaring on marriage. Massey-Mainwaring was a well-known art collector who lent items from his collection to public galleries around the country.
He was involved in Conservative politics and in 1892 put his name forward as a candidate for the Hackney Central constituency.
Eventually he stood aside in favour of Sir Andrew Scoble. He died suddenly from influenza and diabetes at his London home in March 1907, aged 61.
26th United Kingdom Parliament. 27th United Kingdom Parliament]
In 1895 he was elected as member of parliament for Finsbury Central, holding the seat until 1906.