Tommaso de Marini was a slaveholder and citizen of Genoa who was active during the middle of the fifteenth century. He was born named Tommaso Castagna and assumed the de Marini surname after entering into their albergo.
The slaveholder named Stefano Doria enters into an agreement with a merchant from Mallorca named Gaspar Safortesa to transport enslaved Muslims from Chios to Mallorca. The enslaved persons are to be delivered to Pedro Safortesa, the brother of Gaspar. Gaspar agrees to pay the same freight that other Mallorcan merchants had paid a certain Giovanni de Marini for earlier shipments of the same type on his ship.