Margaret de Badlesmere (died 3 Dec 1344/4 Dec 1347) was married before 24 July 1337 to Sir John de Tibetot (Tybotot) (1313-1367). Her sister, Maud (born c1308/10, died probably 24 May 1366), was first the wife of Robert Fitz Payne (died 1322), then was married, before 27 Mar 1336, to John de Vere (1312-1360), Earl of Oxford. Maud and Margaret were two of the four daughters of Bartholomew de Badlesmere (hanged 14 Apr 1322) and his wife, Margaret de Clare.
See The Complete Peerage, X: 222-224 (Oxford); XII(2): 95-97 (Tybotot); Paget's Baronage (No. 21-Badlesmere).