Vol 9 (Jan-Jun 1886), p 195 -
... 1. John Mathew, eldest son, and heir presumptive, who married successively Katherine Kemeys, of Cefn-mabli, after whose death he again married, it is said, his kinswoman, Miss Fleming, daughter of Thomas Fleming, of Flemington. By the first wife he left an only child and sole heiress, Jennet Mathew, who married Sir John Morgan, Knt., living A.D. 1491, and by him had issue two sons, Sir John Morgan, Knt., of Tredegar, ancestor of that line, and Sir Thomas Mathew Morgan, who became progenitor to the family of Morgan of Machen, &c. ...
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[Note: Identifies "Jennet" as a d/o of John Mathew and Katherine Kemeys.]