when the King ordered that the landed nobility and their estates (peasants) be drafted into military service. The Union of Lublin in 1569, united the Kingdom of Poland and the Grand Duchy of Lithuania as one single state, the Polish–Lithuanian Commonwealth, and thus the Sejm was supplemented with new envoys from among the Lithuanian nobility. The Commonwealth ensured that the state of affairs surrounding the three-estates system continued, with the Sejm, Senate and King forming the estates and supreme deliberating body of the state. In the first few decades of the 16th century, the Senate had established its precedence over the Sejm; however, from the mid-1500s onwards, the Sejm became a very powerful representative body of the szlachta ("middle nobility"). Its chambers reserved the final decisions in legislation, taxation, budget, and treasury matters (including military funding), foreign policy, and the confirment of nobility. The 1573 Warsaw Confederation saw the nobles of the Sejm officially sanction and guarantee religious tolerance in Commonwealth territory, ensuring a refuge for those fleeing the ongoing Reformation and Counter-Reformation wars in Europe. Until the end of the 16th century, unanimity was not required, and the majority-voting process was the most commonly used system for voting. Later, with the rise of the Polish magnates and their increasing power, the unanimity principle was re-introduced with the institution of the nobility's right of liberum veto (Latin: "free veto"). Additionally, if the envoys were unable to reach a unanimous decision within six weeks (the time limit of a single session), deliberations were declared void and all previous acts passed by that Sejm were annulled. From the mid-17th century onward, any objection to a Sejm resolution, by either an envoy or a senator, automatically caused the rejection of other, previously approved resolutions. This was because all resolutions passed by a given session of the Sejm formed a whole resolution, and, as such, was published as the annual "constituent act" of the Sejm, e.g. the "Anno Domini 1667" act. In the 16th century, no single person or small group dared to hold up proceedings, but, from the second half of the 17th century, the liberum veto was used to virtually paralyze the Sejm, and brought the Commonwealth to the brink of collapse. The liberum veto was abolished with the adoption of the Constitution of 3 May 1791, a piece of legislation which was passed as the "Government Act", and for which the