William Massey-Mainwaring William Massey-Mainwaring The Honourable William Frederick Barton Massey-Mainwaring (28 May 1845 – 12 March 1907) was an Irish art collector and Conservative Party politician 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. Educated at Trinity College Dublin, he was called to the bar at the Inner Temple, London. In 1872 he married Isabella Anne Milman, a widow and only child of Benjamin Lee Mainwaring of Knaresborough. He assumed the surname Massey-Mainwaring on marriage. Massey-Mainwaring was a well-known art collector
William Mainwaring Alderman David Lewis, Mrs Watts-Morgan (the widow of the former MP), and some local party figures. Mainwaring was selected, and faced opposition from Arthur Horner of the Communist Party and William Thomas, a local Liberal, in the byelection. Mainwaring received a letter of support from Labour Party leader George Lansbury, and an appeal from the President, Vice-President and General Secretary of the South Wales Miners' Federation was made for all miners and their families to vote for him. The Labour Party had won easily in a straight fight with Arthur Horner at the previous election, but the decision of the