Abney Park Cemetery opened in 1840 and contains the graves of many notable people. It was named after Abney House, the estate of Sir Thomas Abney from 1700-1843. The cemetery contains the graves of England's first female aeronaut Margaret Graham, nurse Betsi Cadwaladr who worked in the Crimean War, animal exhibitor Frank Bostock known as "The Animal King", police officer Frederick Tyler who was killed in the Tottenham Outrage, prolific hangman William Ong Calcraft, and Salvation Army founder William Booth. The cemetery was designed with the help of hymn writer Isaac Watts who was a guest at Abney House for 36 years.