Chatgpt gives the following translation. Slightly iffy in a couple of places but hopefully something to work on.
Beside this wall, Thomas Southouse, Esquire, of ancient lineage from the family of Southouse of Selling in the county of Kent, successively descended through connected generations, laid down the remains of his body. He defended the Abbey of Faversham, decaying among its ruins and ashes, from the ravages of time with learned writings. Then, as a most zealous investigator in uncovering the ancient privileges of the Cinque Ports, as a diligent researcher in elucidating obscure volumes of law, and as an untiring explorer in resolving intricate legal disputes, he distinguished himself. After publishing other works of refined literature, he was seized by an unexpected fate and shortly thereafter died, entrusting his learned soul to God.
In his memory, Elizabeth Southouse, his widow, who survives him, grieving, placed this monument as a token of her love and sorrow.