The Senate of the Republic (Italian: Senato della Repubblica) or Senate (Italian: Senato) is a house of the bicameral Italian Parliament (the other being the Chamber of Deputies). The two houses together form a perfect bicameral system, meaning they perform identical functions, but do so separately. Pursuant to Articles 57, 58, and 59 of the Italian Constitution, the Senate has a variable number of members, of which 309 are elected from Italian constituencies, 6 from Italian citizens living abroad, and a small number (currently 6) are senators for life (senatori a vita), either appointed or ex officio. It was established in its current form on 8 May 1948, but previously existed during the Kingdom of Italy as Senato del Regno (Senate of the Kingdom), itself a continuation of the Senato Subalpino (Subalpine Senate) of Sardinia established on 8 May 1848. Members of the Senate are styled Senator or The Honourable Senator (Italian: Onorevole Senatore) and they meet at Palazzo Madama, Rome.