John Ap-Adam: He summoned to parliament on 26 January 1297. He was again summoned from 6 February 1299 until 12 December 1309. He died in 1311 and the title became in abeyance amongst his descendants.
References
^Nicolas, Nicholas Harris (1825). A synopsis of the peerage of England exhibiting, under alphabetical arrangement, the date of creation, descent and present state of every title of peerage which has existed in this country since the conquest. London: J. Nichols and son. p. 22.