The Visegrád Group, also called the Visegrád Four, or V4 is an alliance of four Central European states – Czech Republic,Hungary, Poland and Slovakia – for the purposes of furthering their European integration as well as advancing their military, economic and energy cooperation with one another. The Group’s name in the languages of the four countries is Visegrádská čtyřka or Visegrádská skupina (Czech); Visegrádi Együttműködés or Visegrádi négyek (Hungarian); Grupa Wyszehradzka (Polish); and Vyšehradská skupina or Vyšehradská štvorka (Slovak).
The name of the Visegrad Group is derived, and the place of meeting selected, from a meeting of the Bohemian (Czech), Polish, and Hungarian rulers in Visegrád in 1335. Charles I of Hungary, Casimir III of Poland, and John of Bohemia agreed to create new commercial routes to bypass the staple port Vienna and obtain easier access to other European markets. The recognition of Czech sovereignty over the Duchy of Silesia was also confirmed. A second meeting took place in 1339, where it was decided that after the death of Casimir III of Poland, the son of Charles I of Hungary, Louis I of Hungary, would become King of Poland provided that Casimir did not have a son.