The earliest known parliament in Croatia the minutes and conclusions of which have been preserved convened in Zagreb 738 years ago: on 19 April 1273.

It is then that the name of the parliament was decided upon: the General Assembly (Sabor) of the Whole Kingdom of Slavonia - Congregatio Regni tocius Sclavonie generalis. Its decisions, being called statuta et constitutiones (decrees having the force of law), were authenticated by the ban’s (viceroy’s) seal. The Sabor passed decrees relating to judicature, general insurrection to defend the country, taxes and other levies.

The conclusions of the 1273 Sabor are the first integrally preserved documents in the history of Croatian parliamentarism.