Each of Sheffield's 28 wards is represented by three positions on the council, meaning there are usually 28 seats contested in each local election.
In 1974, Aldermen were abolished, and elections to Sheffield City Council are by thirds, in three years of every four, for a four-year term.
That all changed in 1919; Labour won almost all the seats up for election that year, giving them 12 and their coalition partners the Co-operative Party two.
In response to their losses, the Conservative and Liberal groups merged to form the Citizens Association, retaining control with 32 councillors and 15 aldermen.
A majority on the council and a large number of retiring aldermen finally enabled them to take 8 positions on the aldermanic bench.