The Quaker, Elizabeth Fry, is famed for reforming which UK institution?

Elizabeth Fry (née Gurney, often referred to as Betsy; 21 May 1780 – 12 October 1845) was an English prison reformer, social reformer and, as a Quaker, a Christian philanthropist. She has sometimes been referred to as the "angel of prisons".

Fry was a major driving force behind new legislation to make the treatment of prisoners more humane, and she was supported in her efforts by the reigning monarch. She was depicted on the Bank of England £5 note from 2001-2016. Winston Churchill now shows on the £5 note.

In 1817 she helped found the Association for the Reformation of the Female Prisoners in Newgate. This led to the eventual creation of the British Ladies' Society for Promoting the Reformation of Female Prisoners, widely described by biographers and historians as constituting the first "nationwide" women's organisation in Britain.