Dear Nicola ~ The original source for Joan de Clinton's maiden name appears to be the following: Ormerod, Hist. of the County Palatine & City of Chester 1 (1882): 521–522 (author states Hamon Massy, of Dunham-Massy, Cheshire “was divorced from Alice his wife, and married Joan Clinton, sister of the earl of Huntingdon”). Ormerod cites the following source for this paragraph: Lib. C. fol. 256, q, r, t, x. You can view Ormerod's discussion at the following weblink: https://babel.hathitrust.org/cgi/pt?id=coo.31924088434034;view=1up;seq=644 Best always, Douglas Richardson, Salt Lake City, Utah