Deutsche Bank AG ( literally `` German Bank '' ) is a German and international bank .
These 10 regional banks were later consolidated into three major banks in 1952 : Norddeutsche Bank AG ; SÃ 1\/4 ddeutsche Bank AG ; and Rheinisch-Westf Ã lische Bank AG . In 1957 , these three banks merged to form Deutsche Bank AG with its headquarters in Frankfurt .