After the founding of the Kingdom of Bavaria the state was totally reorganised and, in 1808, divided into 15 administrative government regions (German: Regierungsbezirke (singular Regierungsbezirk)), in Bavaria called Kreise (singular: Kreis). They were created in the fashion of the French departements, quite even in size and population, and named after their main rivers.
In the following years, due to territorial changes (e. g. loss of Tyrol, addition of the Palatinate), the number of Kreise was reduced to 8. One of these was the Rezatkreis (Rezat District). In 1837 king Ludwig I of Bavaria renamed the Kreise after historical territorial names and tribes of the area. This also involved some border changes or territorial swaps. Thus the district name of Rezatkreis change]]d to Upper Franconia.