Bernard James Tindal Bosanquet was an English cricketer best known for inventing the googly, a delivery designed to deceive the batsman. When bowled, it appears to be a leg break, but after pitching the ball turns in the opposite direction to that which is expected, behaving as an off break instead. Bosanquet, who played first-class cricket for Middlesex between 1898 and 1919, appeared in seven Test matches for England as an all-rounder. He was chosen as a Wisden Cricketer of the Year in 1905.

Leg spin is a type of spin bowling in cricket. A leg spinner bowls right-arm with a wrist spin action. The leg spinner's normal delivery causes the ball to spin from right to left when the ball bounces on the pitch. For a right-handed batter, that is away from the leg side, and this is where it gets the name leg break.