It's called Postman's Park because it was a favourite place for the postmen to have their breaks from their work at the nearby sorting office. It is not very large, only about 40 feet wide and about 200 feet in length.
The park is alongside St Botolph's Aldersgate church. It is a former burial ground and has been used as such since about 1050. There are so many bodies buried here that the ground is elevated a couple of feet above the surrounding street levels.
The reason that Postman's Park is so unique is because of a simple but moving small memorial wall built at its western end. This is not a memorial to the great and good, or the famous or kings and queens or military heroes. It is a memorial to the most ordinary of people of all ages who did the most selfless of acts. They died while attempting to save the lives of others. Every memorial tablet is to an ordinary person and describes their act of heroism.
She was a pantomime artiste who "died of terrible injuries" while trying to save her companion who was on fire and she attempted to douse the flames with her dress which then caught fire.