Neolithical finds, show that nomadic
hunter-gatherers lived in the region at least temporarily. Celtic
Boii and
Varisci people settled in the region in pre-Christian times. After conflicts with the
Pannonian Avars,
slavs are presumed to have moved to region in the 8th century. The Slavic roots of the village name Kulm is a reminder of this. In the 9th century a further wave of
bavarian immigrants moved there. In 1245 a document from
Passau mentioned a man named "Dominus Karolus de Alkenperge". 3 years later, another document from Passau mentioned the village. This time as "Altenperge". File:Altenberg (Gemeindeamt).jpg|The at Reichenauer Straße 4, built by from 1927 to 1930. File:Altenberg (Pfarrkirche-1).jpg|The Late
Gothic Catholic church of the
Elisabeth of Hungary. It was partially destroyed by
lightning strikes and rebuilt in 1742 and 1866. (Schulstraße 1) File:Altenberg (Kunst am Bau).jpg|Work of art on a building's wall (Schulstraße 12) File:Altenberg (Kulm 11-1).jpg|A Farm from the 19th century (Kulm 11) ==Population==