▁Through out ▁the ▁ 1 9 th ▁century ▁Irish ▁opposition ▁to ▁the ▁Union ▁was ▁strong , ▁occasionally ▁er upt ing ▁in ▁violent ▁ins urre ction . ▁ ▁The ▁next ▁legisl ature ▁to ▁exist ▁in ▁Ireland ▁only ▁came ▁into ▁being ▁in ▁ 1 9 1 9 . ▁This ▁was ▁an ▁extra - legal , ▁un ic amer al ▁parliament ▁established ▁by ▁Irish ▁republic ans , ▁known ▁simply ▁as ▁D á il ▁É ire ann ▁and ▁thus ▁existed ▁outside ▁of ▁British ▁law . ▁The ▁D á il ▁was ▁notion ally ▁a ▁legisl ature ▁for ▁the ▁whole ▁island ▁of ▁Ireland . ▁The ▁First ▁D á il ▁and ▁the ▁Second ▁D á il ▁did ▁not ▁therefore ▁have ▁any ▁recogn ised ▁legal ▁authority ▁outside ▁Ireland . ▁The ▁Third ▁D á il ▁was ▁elected ▁under ▁the ▁terms ▁of ▁the ▁Ang lo - I r ish ▁Tre aty ▁as ▁a ▁constitu ent ▁assembly ▁to ▁appro ve ▁the ▁Constitution ▁of ▁the ▁Irish ▁Free ▁State ▁and ▁p ave ▁the ▁way ▁for ▁the ▁creation ▁of ▁the ▁new ▁state . ▁Once ▁the ▁Constitution ▁of ▁the ▁Irish ▁Free ▁State ▁was ▁in ▁effect ▁the ▁Third ▁D á il ▁served ▁as ▁the ▁lower ▁house ▁of ▁the ▁O ire acht as . ▁Under ▁the ▁terms ▁of ▁the ▁constitution , ▁however , ▁the ▁Third ▁D á il ▁merely ▁carried ▁out ▁the ▁functions ▁of ▁the ▁D á il ▁during ▁this ▁period ▁until ▁a ▁new ▁chamber ▁could ▁be ▁elected . ▁The ▁first ▁D á il ▁of ▁the ▁Irish ▁Free ▁State ▁was ▁therefore ▁officially ▁the ▁Four th ▁D á il , ▁which