polity "the land of the Hungrin" ("the land of the Hungarians") in a letter to Joseph of the Khazars of c. 960. The Latin phrase ("Hungarian Nation") was a medieval and early modern era geographic, institutional and juridico-political category in Kingdom of Hungary without any ethnic connotation. The medieval "Natio Hungarica" consisted only the members of the Hungarian Parliament, which was composed of the nobility, Roman Catholic prelates, and the elected parliamentary envoys of the Royal free cities, which represented the city burghers. The other important - and more numerous - component of Natio Hungarica was the noble members of the county assemblies in the county seats, Kingdom of Hungary had 72 counties, (regardless of the real ethnicity and mother tongue of the noblemen, clergymen and city bourgeoisie of the kingdom). Those who had no direct participation in the political life on national [parliamentary] or local [counties] level (like the common people of the cities, towns, or the peasantry of the villages) were not considered part of the Natio Hungarica. This old medieval origin convention was also adopted officially in the Treaty of Szatmár of 1711 and the Pragmatic Sanction of 1723; remained until 1848, when the Hungarian nobility was abolished; and thereafter acquired a sense of ethnic nationalism. is a toponym derived from the name of the (), a group of tribes that inhabited the Drava River Basin in the 2nd century BC. They were presumably Illyrian tribes that had been Celticized in the 3rd century BC. Julius Pokorny suggested an Illyrian etymology for this name, derived from a PIE root *pen- ("swamp" or "marsh"; cognate with English "fen"). The territory of the in the Drava River Basin later formed the geographical center of the Province of "Pannonia" of the ancient Roman Empire. Later, the territory of the medieval Kingdom of Hungary included that of former , and Medieval Latin transferred the denomination of to the territory of the Western parts of the Kingdom of Hungary. Further, the King of Hungary was given the title of ("King of Pannonia") and ("King of the Pannonians"). The name "Pannonian" comes from Pannonia, a province of the Roman Empire. Only the western part of the territory (the so-called Transdanubia) of modern Hungary formed part of the ancient Roman Province of Pannonia; this comprises less than 29% of modern Hungary, therefore Hungarian geographers avoid the terms "Pannonian Basin" and "Pannonian Plain". Modern era