él ▁Con a ill , ▁the ▁tu ath a ▁was ▁a ▁sub - unit ▁of ▁the ▁larger ▁kingdom ▁of ▁A ile ch , ▁along ▁with ▁their ▁C en él ▁n E óg ain ▁c ous ins , ▁fellow ▁descend ants ▁of ▁Ni all ▁of ▁the ▁N ine ▁Host ages . ▁Their ▁initial ▁as cent ▁had ▁coinc ided ▁with ▁the ▁decl ine ▁of ▁the ▁U la id , ▁whose ▁kingdom ▁of ▁Ul ster ▁re ced ed ▁to ▁the ▁north - east ▁coast . ▁In ▁the ▁ 1 2 th ▁century ▁the ▁kingdom ▁of ▁A ile ch ▁split ▁into ▁two ▁so ver eign ▁territ ories ▁and ▁C en él ▁Con a ill ▁became ▁T ír ▁Ch ona ill ▁under ▁the ▁Ó ▁Dom h na ill ▁( O ' D onn ell ) ▁cl an . ▁It ▁was ▁the ▁location ▁of ▁fighting ▁during ▁the ▁N ine ▁Years ' ▁War ▁( I reland ) ▁at ▁the ▁end ▁of ▁the ▁ 1 6 th ▁Century . ▁It ▁continued ▁to ▁exist ▁until ▁the ▁ 1 7 th ▁century ▁when ▁it ▁was ▁incorpor ated ▁into ▁the ▁English - ru led ▁Kingdom ▁of ▁Ireland ▁following ▁the ▁Fl ight ▁of ▁the ▁Ear ls . ▁ ▁Ge ograph ically ▁It ▁lay ▁in ▁the ▁area ▁now ▁more ▁commonly ▁referred ▁to ▁as ▁County ▁Don eg al , ▁although ▁the ▁kingdom ▁and ▁later ▁princip ality ▁of ▁T yr conn ell ▁was ▁larger ▁than ▁that , ▁including ▁parts ▁of ▁S lig o , ▁Le it rim ▁( in ▁present - day ▁Republic ▁of ▁Ireland ), ▁T yr