Speaker Denison's rule
Speaker Denison's rule is a constitutional convention established by John Evelyn Denison, who was Speaker of the British House of Commons from 1857 to 1872, regarding how the Speaker decides on their casting vote in the event of a tie in the number of votes cast in a division. In 1867, when a tie arose on a motion on Fellowships at Trinity College, Dublin, Denison gave his casting vote against the motion, declaring that any decision must be approved by the majority.