Castle is situated on the mountain that holds a strategic point in
the region. First evidence of human presence date back to Neolithic
Period. Later it was replaced by Celtic and later Roman settlement.
First wooden stronghold on a site of current Haimburg citadel was erected to protect locals against
constant raids by the Avars.
Current military fortifications were erected in 1070-
1103. It was constructed by a powerful family of Counts of Heunburg,
but the family died out in 1322 and Haimburg Castle passed to the
Earls of Pfannberg. Unfortunately that family also left no heirs and
upon death of the last male in that line castle passed to the Counts
of Gorizia in 1362 who pased the fortress to the Habsburg dynasty
according to peace of Pusarnitz.
Today Heimburg Castle is privately owned (sine 1990)
by Verein Rettet die Heunburg and it
is open to the public. Since 2011 Heimburg Theater is performing
within its medieval walls during summer months.