The first mention of modern Hägglingen is in 1036 when Count Ulrich von Lenzburg granted the church and farm of "Hekelingen" to Beromünster. In the acknowledgments of Emperor Henry III in 1045, the village of "Hackelingen" was mentioned. Frederick I Barbarossa acknowledged the grants to the village in 1173. The Vogtei (bailiwick) went from the Lenzburg family to the Kyburgs and then in 1273 to the Lords of Hallwyl. The high court rights were exercised by the Habsburgs until the Swiss conquered the Aargau in 1415. It was not until 1425 that Hägglingen, which was claimed by Lucerne, came under the authority of the entire Confederacy. It was first assigned to the district court of Wohlenschwil before it became an independent municipality from 1435-1712.