High Quality Content by WIKIPEDIA articles! The Oireachtas is the "national parliament" or legislature of Ireland, sometimes referred to as Oireachtas Éireann. The Oireachtas consists of: The President of Ireland The two Houses of the Oireachtas: o Dáil Éireann, o Seanad Éireann. The Houses of the Oireachtas sit in Leinster House in Dublin, an eighteenth century ducal palace. The directly-elected Dáil is by far the most powerful branch of the Oireachtas.