It is unclear whether there was an earlier castle or why the Tumb von Neuburg family acquired land in Graubünden.

In 1396 Frik Tumb quarreled with Ulrich Brun von Rhäzüns, which led to a feud between the two families and Neuburg Castle being besieged.

In 1400 Johann von Neuburg became a vassal to the Bishop of Chur to protect his claim to the castle.

The original high entrance was located on the west, about 2 m (6.6 ft) above ground level.

[2] North and west of the keep, the foundations and portions of the curtain wall and gatehouse are still visible.