Au and Haidhausen used to be hostel areas for trade workers and day labourers outside of the medieval town walls of Munich. Both formerly independent municipalities were incorporated into the City of Munich on 1 October 1854 and developed into suburbs during the Gründerzeit.
In the past, Au and Haidhausen functioned as temporary accommodations for artisans and day laborers on the outskirts of medieval Munich. Upon joining the City of Munich in 1854, these areas transformed into suburban neighborhoods that defined the character of the Gründerzeit era.