The Constitution of Ireland, Article 15, section 2, subsection 2. Retrieved from http://www.taoiseach.gov.ie/upload/static/256.htm on August 18, 2010. Extract: "Provision may however be made by law for the creation or recognition of subordinate legislatures and for the powers and functions of these legislatures. " This theoretically provides that sub-national legislatures may be established by the Oireachtas.
