Constantinsborg is a manor in Aarhus Municipality, Denmark which has existed since at least 1400. It is situated on the southern shore of Årslev Engsø, a newly created nature reserve and shallow lake extension of Brabrand Lake, in Viby J 10 km. south-west of Aarhus. The manor and estate are privately owned today and ran as a farm. Constantinsborg was originally known as Stadsgaard but was later renamed after Constantin Marselis who owned the estate in the 1600s. In the 1800s the Pontoppidan family owned the estate and came to have a large impact on Danish agriculture and the transformation of the Jutland moors into agricultural land. The current main manor building was constructed in the early 1800s while adjoining farm buildings date back to 1870 and the 20th century.
