. ▁The ▁Kenn ed ys ▁who ▁settled ▁in ▁Ul ster ▁are ▁mostly ▁of ▁Scottish ▁origin ▁from ▁the ▁territ ories ▁of ▁Gall ow ay ▁and ▁A yr ▁just ▁across ▁the ▁Irish ▁Sea ▁ 2 0   m iles ▁away . ▁Many ▁Scottish ▁Kenn ed ys ▁were ▁plan ters ▁in ▁Ul ster , ▁and ▁many ▁Sc ots ▁went ▁south ▁to ▁Dublin ▁and ▁m ing led ▁with ▁the ▁Irish ▁cl an . ▁ ▁In ▁the ▁after math ▁of ▁the ▁Black ▁Death , ▁there ▁was ▁a ▁G ael ic ▁res urg ence ▁in ▁Ireland ▁as ▁the ▁pl ague ▁more ▁heavily ▁hit ▁the ▁Norm ans ▁in ▁the ▁urban ised ▁areas . ▁The ▁main ▁riv als ▁of ▁the ▁O ' K enn ed ys ▁were ▁the ▁Norman - desc ended ▁But lers ▁who ▁were ▁Ear ls ▁of ▁Or mond ▁( a ▁title ▁of ▁the ▁Lord ship ▁of ▁Ireland ). ▁ ▁The ▁two ▁families ▁signed ▁a ▁peace ▁treat y ▁in ▁ 1 3 3 6 , ▁followed ▁by ▁another ▁in ▁ 1 3 4 7 . ▁The ▁latter ▁was ▁broke ▁when ▁the ▁O ' K enn ed ys , ▁with ▁their ▁Irish ▁al lies , ▁the ▁O ' B ri ens ▁and ▁O ' Car roll s , ▁attacked ▁and ▁burn ed ▁N en agh . ▁The ▁O ' K enn ed ys ▁were ▁able ▁to ▁use ▁the ▁Butler – F itz G er ald ▁dispute ▁to ▁attack ▁the ▁But lers ▁whenever ▁they ▁were ▁over st retch ed ▁by ▁attacks ▁from ▁the ▁Earl ▁of ▁Des mond . ▁The ▁O '