17 March 1921
On 17 March 1921 the Polish parliament adopted a constitution which determined the shape of the reborn state. Poland became a democratic republic with a bicameral parliament elected every five years and a president elected every seven years. Initially, when work on the Constitution was still going on, highest authority was held by the Chief of State Józef Piłsudski. Once Poland’s first ever President, Gabriel Narutowicz, was elected, the Chief of State transferred the executive authority to him.