A blue plaque is a permanent sign to commemorate a link between that location and a famous person, event, or former building on the site, which serves as a historical marker -kb with some placed by English Heritage and others by Portsmouth City Council.
There are a number of them in the city – we take a look at where some of them are and who they celebrate:
![Renaissance historian Dame Frances A Yates has a blue plaque at the house where she was born at 53 Victoria Road North, Southsea](https://www.portsmouth.co.uk/webimg/b25lY21zOjQ3NWJkZTUzLWI5YTAtNDk5My04NDIxLTkyMTY0ZWVlZjVjYjoyZjI2MDI0Ny1jYWQ2LTQ4NzYtYjEwZi1kMjI5OGQzNDM1NGM=.jpg?crop=3:2&trim=&width=742)
13. Dame Frances A Yates
Renaissance historian Dame Frances A Yates has a blue plaque at the house where she was born at 53 Victoria Road North, SouthseaPhoto: Google Streetview
![It may not be blue, but Arthur Conan Doyle is celebrated with a brown plaque which can be found on the side of Bush House, Elm Grove, Southsea where first two Sherlock Holmes novels were written. He practiced as a doctor in the city at No. 1 Bush Villas which formerly stood on the site.](https://www.portsmouth.co.uk/webimg/b25lY21zOmU2OGQxYzZlLTc2MjktNDMyOC05YjZjLWMxZjgxN2Q3OWU5ZTowZTJlZGJiYi1mNjE0LTQ0NTctODU5My0zMzJiN2U1N2E5OWY=.jpg?crop=3:2&trim=&width=541)
14. Sir Arthur Conan Doyle
It may not be blue, but Arthur Conan Doyle is celebrated with a brown plaque which can be found on the side of Bush House, Elm Grove, Southsea where first two Sherlock Holmes novels were written. He practiced as a doctor in the city at No. 1 Bush Villas which formerly stood on the site.Photo: Contributed