Vorburg, Oberurnen

Vorburg, medieval castle ruins in Oberurnen, Switzerland, was probably built or expanded by the Habsburgs.

During the High Middle Ages the land around Oberurnen belonged to Schänis Abbey, while taxes from the area were paid to Säckingen Abbey. In 1264 the Habsburgs inherited the bailiwick of Glarus from the Counts of Kyburg, and in 1288 Säckingen Abbey granted a fief over its lands to the Habsburgs. To strengthen their hold on Glarus the Habsburgs constructed Näfels Castle and appear to have built or enlarged Vorburg; by about 1300 the site served as an administrative centre for Habsburg authority in the region.

In the mid-fourteenth century Vorburg was the residence of the Austrian vogt Hermann von Landenberg. Conflict followed when Glarus rebelled against Habsburg rule in 1351 and destroyed Näfels Castle. Contemporary records do not confirm whether Vorburg was attacked at that time, though the wider fighting affected nearby strongholds. After the loss of Näfels the castle at Vorburg was probably enlarged, either under Habsburg direction or by forces from Glarus.

The castle appears in documentary records in 1369 when Rudolf Stucki used it as collateral, and it is named in 1386 as a refuge castle, suggesting it was not continuously occupied as a residence. During the fifteenth century the site was abandoned and fell into ruin; many stones show that a major fire occurred, but surviving documents do not state whether the blaze resulted from accident or an assault.

Repair and investigation of the ruin continued in later centuries. In the nineteenth century work preserved and repaired the north‑west wall of the tower. In 1940 the south ring wall was excavated and made stable. Archaeological investigation in 1970 uncovered traces of an outbuilding and a layer of animal bones. Since 2002 the foundation Pro Vorburg Oberurnen has maintained the ruins and cleared vegetation, with Ernst Küng constructing a well and a small tool shed to support maintenance. From 2017 the foundation, together with experts, began structural work to secure the site, clearing internal rubble and reinforcing walls in an initial phase. Following a 2020 motion by Landrat Steve Nann, the cantonal government allocated CHF 605,645 in 2021 to support the foundation’s conservation work.