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").
Stephen Foster (Lord Mayor of London) William Rowley's (15861626) play "A New Wonder, a Woman Never Vexed", based on their lives. Stephen Foster (Lord Mayor of London) Sir Stephen Foster (fl. 1454) was a fishmonger and later Lord Mayor of London. He was the son of Robert Foster of London, a stockfish merchant. Elected Sheriff of London in 1444, he became Lord Mayor of London in 1454, and served as the city's Member of Parliament in King Henry VI's 13th parliament. According to historian John Strype, Foster married a widow named Agnes, who enlarged Ludgate prison (where Foster had at one time been imprisoned for debt)