▁for ▁nearly ▁another ▁century . ▁The ▁Ear ld om ▁of ▁Ul ster , ▁already ▁weak ened ▁by ▁the ▁Bruce ▁invasion , ▁col lapsed ▁following ▁the ▁assass ination ▁of ▁William ▁D onn ▁de ▁Burg h ▁in ▁ 1 3 3 3 . ▁It ▁is ▁unknown ▁what ▁role ▁the ▁B isset ts ▁might ▁have ▁played ▁in ▁this , ▁but ▁half ▁a ▁century ▁later ▁in ▁ 1 3 8 3 ▁they ▁are ▁found ▁probably ▁al lied ▁with ▁the ▁O ' Ne ills ▁against ▁the ▁rem n ants ▁of ▁the ▁ear ld om , ▁which ▁were ▁led ▁by ▁the ▁Sav age ▁family . ▁In ▁that ▁year ▁Ni all ▁M ór ▁Ó ▁Né ill , ▁King ▁of ▁Ul ster ▁launched ▁a ▁massive ▁assault ▁against ▁the ▁remaining ▁English ▁in ▁the ▁north ▁of ▁Ireland , ▁burning ▁their ▁towns ▁and ▁lay ing ▁waste ▁their ▁territ ories , ▁and ▁following ▁one ▁eng agement ▁Sein ic in ▁Finn ▁B iss ett , ▁a ▁son ▁of ▁the ▁Mac ▁E oin , ▁is ▁found ▁dispatch ing ▁the ▁wounded ▁Ra ibil in ▁Sav age , ▁oppon ent ▁of ▁A od h ▁Ó g ▁Ó ▁Né ill ▁in ▁the ▁battle . ▁B iss ett ▁is ▁himself ▁s lain ▁by ▁Sav age ' s ▁people ▁in ▁reven ge ▁for ▁this . ▁ ▁That ▁the ▁B isset ts ▁were ▁now ▁formally ▁al lied ▁to ▁the ▁O ' Ne ills ▁may ▁be ▁supported ▁by ▁several ▁not ices ▁in ▁ 1 3 8 7 ▁of ▁the ▁death ▁of ▁one ▁Sab ia ▁O ' Ne ill ▁( S ad h b h