Lord Mayor of London been mandatory for election to the Lord Mayoralty. Two Sheriffs are selected annually by Common Hall, which meets on Midsummer's Day for this purpose. By an ordinance of 1435, the Lord Mayor must be chosen from amongst the Aldermen of the City of London. Those on the electoral roll of each of the City's 25 Wards select one Alderman, who formerly held office for life or until resignation. Now each Alderman must submit for re-election at least once in every six years. The Lord Mayor is then sworn in November, on the day before the Lord Mayor's Show ("see below").
Thomas Myddelton (Lord Mayor of London) in the creation of the New River which supplied London with fresh water from 1613. He married four times. By his first wife Hester, a daughter of Sir Richard Saltonstall, he was the father of Thomas Myddelton of Chirk Castle. His younger son, Timothy, inherited his estates in Essex. By his third marriage he gained a stepson, Miles Hobart. Along with Rowland Heylyn, Myddelton financed the publication of a Welsh language Bible suitable for everyday use. Thomas Myddelton (Lord Mayor of London) Sir Thomas Myddelton (1550 – 12 August 1631) was the fourth son of Richard Myddelton, Governor of Denbigh,