▁seat ▁of ▁the ▁k ings ▁of ▁G w yn ed d , ▁and ▁control ▁of ▁it ▁may ▁have ▁been ▁sought ▁by ▁the ▁Me ic ▁Ara ilt ▁as ▁a ▁way ▁to ▁further ▁ensure ▁the ▁control ▁of ▁the ▁surrounding ▁sea - lan es . ▁ ▁According ▁to ▁the ▁" B " ▁version ▁of ▁the ▁ele vent h - ▁to ▁th ir teenth - century ▁Ann ales ▁Camb ri æ , ▁an ▁un ident ified ▁son ▁of ▁Ar alt ▁was ted ▁this ▁island ▁off ▁the ▁north - west ▁Wel sh ▁coast . ▁The ▁th ir teenth - ▁and ▁four teenth - century ▁texts ▁Br ut ▁y ▁T yw ys ogy on ▁and ▁B ren h ined d ▁y ▁Sa ess on ▁cor ro bor ate ▁this ▁record ▁and ▁identify ▁the ▁attack er ▁as ▁Mac cus ▁himself . ▁Mac cus ' ▁assault ▁target ed ▁Pen mon ▁on ▁the ▁eastern ▁coast ▁of ▁the ▁island . ▁Several ▁near - cont empor ary ▁eng ra ved ▁cross es ▁at ▁Pen mon ▁indicate ▁that ▁it ▁was ▁a ▁significant ▁ecc les iast ical ▁site ▁with ▁important ▁pat rons . ▁Both ▁Br ut ▁y ▁T yw ys ogy on ▁and ▁B ren h ined d ▁y ▁Sa ess on ▁further ▁reve al ▁that ▁G of raid ▁attacked ▁Ang les ey ▁the ▁next ▁year , ▁and ▁thereby ▁brought ▁the ▁island ▁under ▁his ▁control . ▁At ▁the ▁time ▁of ▁the ▁Me ic ▁Ara ilt ▁kind red ' s ▁attacks , ▁the ▁Kingdom ▁of ▁G w yn ed d ▁was ▁in ▁the ▁midst ▁of ▁v icious