4 the anglo-irish treaty was ratified by (i) the british parliament (commons, lords &amp; royal assent), (ii) dáil éireann, and the (iii) the house of commons of southern ireland, a parliament created under the british "government of ireland act 1920" which was supposedly the valid parliament of southern ireland in british eyes and which had an almost identical membership of the dáil, but which nevertheless had to assemble separately under the treaty's provisions to approve the treaty, the treaty thus being ratified under both british and irish constitutional theory.