The Grödig estates were administrated by the Salzburg St Peter's Abbey. The monks had an artificial watercourse (Almkanal) built, running from the Berchtesgadener Ache via Grödig to the Salzburg city centre, including a passage through the Mönchsberg hill. About 1350, Glanegg Castle appeared as administrative seat of the Salzburg prince-archbishops. Under the rule of Leonhard von Keutschach (1495-1519) and Mark Sittich von Hohenems (1612-1619), it was rebuilt as a tower castle and later became part of the Salzburg fortress system. Upon the secularisation of the prince-archbishopric in 1803, the building was purchased by Elector Ferdinand III and remained a private property up to today.