WILLIAM MOSTYN , served under William Herbert , earl of Pembroke , at the time of Wyatt 's Rebellion. He was returned to Parliament for Flintshire 2 March 1553/4 , and again in Nov. of that year ( 1554 ).

He was high sheriff of Flintshire three times and of Caernarvonshire ( 1566-7 ). On 8 May 1572 he was again returned as Member of Parliament for Flintshire and he was the member when he d. in 1576 .

He was one of the commissioners named by queen Elizabeth for holding the second Caerwys eisteddfod ( 1568 ); in the commission it is set forth that ‘ William Mostyn esquior and his auncestors have had the gyfte and bestowing of the Sylver harpe appertayning to the Cheff of that facultie .’ He d. 19 Sept. 1576