It is said, to be considered a true cockney you have to be born within earshot of which London church bells?

St Mary-le-Bow is a historic church rebuilt after the Great Fire of 1666 by Sir Christopher Wren in the City of London on the main east–west thoroughfare, Cheapside. The bells are referred to in the nursery rhyme "Oranges and Lemons"; traditionally, people born within earshot of Bow Bells are considered to be "Cockney".

A Cockney is a certain type of Londoner. The term mainly refers to speakers of the distinctive Cockney dialect of English used in and around London, particularly by the working and lower-middle classes; especially people from the East End, or, traditionally, people born within earshot of Bow Bells.

The church of St Mary-le-Bow is one of the oldest, largest and historically most important of the many churches in the City of London. The definition based on being born within earshot of the bells, cast at the Whitechapel Bell Foundry, reflects the early definition of the term as relating to all London.