It manages six historic sites, including Lewes Castle and Fishbourne Roman Palace.
On 18 June 1846 a meeting was convened by Mark Antony Lower, William Henry Blaauw and William Figg at County Hall in Lewes at which the Sussex Archaeological Society was formally established.
It manages six historic properties and museums, which are open to the public: In 2006 the Society began an archeological investigation in the Tide Mills area,[3] which, according to the Newhaven Local & Maritime Museum, would include not only the tide mill but also a record of the entire East Beach site, comprising the mills, railway station, nurses home, Chailey Heritage Marine Hospital, Newhaven Seaplane Base, holiday homes and the Newhaven Marconi Radio Station.
In 2020 the society received a £250,000 grant from the National Lottery Heritage Fund to cover costs during the Covid-19 pandemic.
[5] The Society has published an official journal, Sussex Archaeological Collections, annually since 1848 with a few gaps.