The chief negotiators of the treaty were Maximilian von und zu Trauttmansdorff and Nikolaus Esterházy de Galántha.
[1][2] To take advantage of Ferdinand's preoccupation with the Bohemian Revolt at the beginning of the Thirty Years' War, Bethlen invaded Habsburg-controlled Royal Hungary in 1618 and fully conquered its north until 1620.
[3] Although a peace was settled in January 1620 giving Bethlen 13 counties in eastern Royal Hungary, the prince resumed the war in September.
Ferdinand's defeat of the Bohemians at the Battle of White Mountain in November allowed him to focus his forces on Bethlen, and the emperor was able to reconquer most of Royal Hungary by 1621.
In addition, Bethlen secured the (purely formal) title of "Imperial Prince" (of Transylvania), seven counties around the Upper Tisza River (in present-day Slovakia, Ukraine, Hungary, and Romania), the fortresses of Tokaj, Munkács, and Ecsed, and a duchy in Silesia.