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9/20/1260, Marlborough, Humphrey de Bohun, earl of Hereford and Essex, John de Plessis, earl of Warwick, Henry of Almain, the king’s nephew, John Mansel, treasurer of York, Eudo la Zouche, Humphrey de Bohun, junior, Robert de Tweng, … (S) The Royal Charter Witness Lists of Henry III, V292, P130.
8/29/1266, Simple protection, until Easter for Robert de Tweng, John de Oketon, … executors of the will of John Mansell, treasurer of York. (S) CPRs.
12/6/1271, Whereas the king granted to Robert de Tweng for life that he might appoint one or two attorneys to do his suit at the county of York every year … (S) CPRs.
6/12/1282, Walter de Huntingcumbe … owes … 10 marks … 60 marks … found as sureties Robert de Tweng, John son of Marmaduke, and Marmaduke de Twenge, … (S) CCRs.
· 2/27/1285, Grant to William le Latymer … of the custody of Lucy, daughter and heiress of Robert de Twenge, tenant in chief, of the following lands late of the said Robert, … manor of Broughton with the hamlet of Skynergryne, … manor of Jarum, … manors of Daneby and Lelum. (S) CPRs. [Jarum was an inheritance from Peter de Brus.]
· 10/6/1359, Inspeximus … letters … ordaining of Thomas de Thweng, rector and patron of the church of Lythom, … for the good estate of the said Thomas … Robert de Thweng, Maud, his wife, Marmaduke Thweng, Lucy, his wife, Marmaduke de Thweng, Isabel, his wife, Marmaduke, William, Robert, John and Nicholas, brother of the said Thomas, … (S) CPRs.