"Sampson Gideon was born at London Wall, City of London, second son in five children of Rowland Gideon (né Rohiel Abudiente), who traded in the West Indies, and his second wife Esther de Porto (also Jewish), daughter of Domingo (or Abraham) do Porto, a diamond buyer in Madras, India.Sampson Gideon's paternal grandfather Moses Abudiente was a Sephardi born at Lisbon, Portugal, but moved to Glückstadt at Holstein an area close to Hamburg, where Rowland Gideon was born.