Marmaduke de Thweng of Kilton

✓ Marmaduke de Thweng of Kilton Castle in Cleveland, husband of Lucy de Brus. CP 1st ed. VII p.400: 'Marmaduke de Thweng, of Kilton Castle, in Cleveland, co. York, who m. Lucy, sister and coheir of Peter Bruce, of Skelton'; their 2nd son Marmaduke (1st Lord Thweng, summoned 1307-22, m. Isabel da. of William de Ros of Igmanthorpe, d. 1323) 'became heir male ... on the death s.p.m. of his elder br. Robert'; a third son John received Cornbrough from Marmaduke and Isabel (VCH). Cal. IPM I no. 636 (1265/6): Roger de Merley's youngest daughter, aged 8, 'was married ... to the son and heir of Marmaduke de Tueng' [Robert]; Cal. IPM I no. 800 (1272): on the partition of the Brus of Skelton estates 'the part of Marmaduke de Tueng and Lucy his wife' - Danby manor and forest, Brotton and Skinningrove, Yarm, Great Moorsholm, the chase of the dales. Marmaduke de Thweng had a lordship in Cornbrough in 1285 (Kirkby's Inquest, VCH). Death date not entered: Cal. IPM II (1289/90) refers to 'the heir of Marmaduke de Thwenge, who is in the king's wardship', while CP 1st ed. has a Marmaduke of Kilton summoned to the king in June 1294 - which generation each refers to is for CP 2nd ed. XII/1 (not online) to settle. Source: Complete Peerage, 1st ed. (G.E.C.), vol. VII p.400 'Thweng' (archive.org completepeerage07cokahrish), read 27 Oct 2026; Source: Calendar of Inquisitions Post Mortem vol. I (Henry III) no. 800 (archive.org calendarofinquis01grea), read 27 Oct 2026; Source: VCH Yorkshire North Riding vol. 2 (1923), 'Parishes: Sheriff Hutton' - Cornbrough manor (british-history.ac.uk/vch/yorks/north/vol2/pp172-187), read 27 Oct 2026. [DIRECT ANCESTOR OF THE COMPILER: flag added 27 Oct 2026 by walking the tree from Aynsley, so that this marker is reliable and can be searched.]