[1] However, in the chronicle of Muri Abbey, a castle that could perhaps fit Ruine Wulp's description - a castle in proximity to Zurich and Lake Zurich - was mentioned, but this has not been confirmed by other findings and is mere speculation.

[1] Also, a person named Eghart of Küsnacht was mentioned in the chronicle and several other documents to be the owner of the castle in the late 11th century.

[1] After an unknown period of time, the Barons von Regensberg are known to have assumed ownership of Ruine Wulp, and also are known to have made plans to completely renovate the castle, but the plans probably were never realised.

The task was performed by the adornment association Küsnacht, and in 1923, the area and castle were placed under the protection and responsibility of the federation.

[1] Some theories include: Little remains of the castle, and only small and insignificant ruins of the tower foundation and main wall can be defined clearly.