The "Lands of the Hungarian Crown" were the territories that the King of Hungary ruled nominally or absolutely, and therefore the phrase denominates the royal demesnes of Hungary.
They are distinct from the Lands of the Crown of Saint Stephen, which denominates the Lands of the Hungarian Crown as a constituent part of the territory of Austria-Hungary during the totality of the subordination of Hungary to Austria-Hungary, from 30 March 1867 - 16 November 1918. Therefore the Lands of the Hungarian Crown constituted part of the later Lands of the Crown of Saint Stephen (from 1867-1918).
St. King Ladislaus I used the title of "King of Slavonia" in 1091 (?).
In 1102, during the reign of King Coloman of Hungary, the Kingdom of Croatia entered a dynastic union with the Kingdom of Hungary, and thereby Croatia became an autonomous kingdom within Hungary and subject to the Hungarian Crown. Therefore successive Hungarian kings bore the additional title of "King of Croatia and Dalmatia".
In 1136, King Béla II invaded the Kingdom of Bosnia for the first time and initiated the long enduring subjection of Bosnia to the Hungarian Crown. In 1137, King Béla II assumed the title of "King of Rama" ("Rex Ramae") to signify his rule of Bosnia, "Rama" being the name of a river in Bosnia, and his successors were also so styled. King Béla II also instituted the inferior title of "Duke of Bosnia" as an honorary title for his adult son, later King Ladislaus II.
After Stefan Nemanja and his son Vukan Nemanjić swore fealty to King Emeric, he assumed the title of King of Serbia ("Rex Serviae") in 1202.