The region became a part of Bavaria in the late 12th century, when the line of the counts of Regensburg and Stefling came to an end. While Regensburg became a Free Imperial City (meaning subordinate to the
emperor only), the surrounding lands were Bavarian property. On 1 April 1938, the city acquired the municipalities of Dechbetten, Großprüfening, and Ziegetsdorf from the Regensburg District Office (
Bezirksamt). On 1 January 1939—as was the case throughout the rest of the
German Reich—the designation "Landkreis" (rural district) was introduced. Thus, the Regensburg District Office became the Regensburg Rural District. While the district dates back to medieval times, its present shape was established in 1972. ==Geography==