William McArthur (Lord Mayor of London) William McArthur (Lord Mayor of London) Sir William McArthur, (6 July 1809 – 16 November 1887) was an Irish businessman and Lord Mayor of London, and a Liberal Party politician who sat in the House of Commons from 1868 to 1885. McArthur was born at Malin, County Donegal, the son of Rev. John McArthur, a Methodist minister in Londonderry. In 1821 he was apprenticed to a woollen draper in Enniskillen. He moved to Lurgan in 1825 where he was a merchant and in 1831 established a drapery business in Derry initially in a partnership, but later on his own. In
Lord Mayor of London who holds the office is also known as a Lord Mayor. The wife of a male Lord Mayor is styled as Lady Mayoress, but no equivalent title exists for the husband of a female Lord Mayor. A female Lord Mayor or an unmarried male Lord Mayor may appoint a female consort, usually a fellow member of the corporation, to the role of Lady Mayoress. In speech, a Lord Mayor is referred to as "My Lord Mayor", and a Lady Mayoress as "My Lady Mayoress". It was once customary for Lord Mayors to be appointed knights upon taking office and baronets