Rzeczpospolita in the context of "Polish-Lithuanian Commonwealth"

The Polish–Lithuanian Commonwealth, also referred to as Poland–Lithuania or the First Polish Republic (Polish: I Rzeczpospolita), was a federative real union between the Kingdom of Poland and the Grand Duchy of Lithuania, existing from 1569 to 1795. This state was among the largest, most populated countries of 16th- to 18th-century Europe. At its peak in the early 17th century, the Commonwealth spanned approximately 1,000,000 km (390,000 sq mi) and supported a multi-ethnic population of around 12 million as of 1618. The official languages of the Commonwealth were Polish and Latin, with Catholicism as the state religion.

The Union of Lublin established the Commonwealth as a single entity on 1 July 1569. The two nations had previously been in a personal union since the Krewo Agreement of 1385 (Polish–Lithuanian union) and the subsequent marriage of Queen Jadwiga of Poland to Grand Duke Jogaila of Lithuania, who was crowned as Władysław II Jagiełło, jure uxoris King of Poland. Their descendant, Sigismund II Augustus, enforced the merger to strengthen frontiers of his dominion and maintain unity. As he remained childless, his death in 1572 marked the end of the Jagiellonian dynasty. It introduced an elective monarchy, whereupon members of domestic noble families or external dynasties were elected to the throne for life.

Golden Liberty (Latin: Aurea Libertas; Polish: Złota Wolność [ˈzwɔ.ta ˈvɔl.nɔɕt͡ɕ], Lithuanian: Auksinė laisvė), sometimes referred to as Golden Freedoms, Nobles' Democracy or Nobles' Commonwealth (Polish: Rzeczpospolita Szlachecka or Złota wolność szlachecka) was a political system in the Kingdom of Poland and, after the Union of Lublin (1569), in the Polish–Lithuanian Commonwealth. Under that system, all nobles (szlachta), regardless of rank, economic status or their ethnic background were considered to have equal legal status and enjoyed extensive legal rights and privileges. The nobility controlled the legislature (the Sejm—the parliament) and the Commonwealth's elected king.