The settlement in Transylvania of the Székely…

The settlement in Transylvania of the Székely (Szeklers, a people akin to the Magyars) and the Saxons (Germans), probably as frontier guards, had helped Hungary to consolidate the administration of the region, in which the Magyars have encouraged political and economic development.

Despite the interruption caused by the Mongol invasion of 1241, Transylvania (while remaining part of the Hungarian kingdom) has evolved into a distinctive autonomous unit, with its special voivode (or governor), its united, although heterogeneous, leadership (descended from Szekler, Saxon, and Magyar colonists), and its own constitution.

Transylvania's noblemen convoke their own assembly, or Diet, in 1288.