Marmaduke Thweng, 1st Baron Thweng English knight and baron (1250–1323) Children Robert de Thweng, 3rd Lord Thweng Katharine Thweng Lucy de Thweng William de Thweng, 2nd Lord Thweng Thomas Thweng, 4th Lord Thweng Marmaduke de Thweng Partners Isabel de Ros