[4] Polhov Gradec was first mentioned in written records under the German name Pilchgrez in 1261 (Pilchgraez in 1269, and simply Graetz in 1291; cf.

According to the legend, which is reproduced in material for tourists, a traveler once spent the night at Polhov Gradec Castle.

[8]: 426 Polhov Gradec Castle (Polhograjska graščina) is a large mansion in the settlement.

[9] At the beginning of the 19th century ownership passed through by virtue of marriage to the Counts Ursini von Blagay.

The Delago family was forcibly deported to Austria by the Yugoslav Secret Police (OZNA) on 18 December 1945 and the manor was then nationalized and plundered.

In 1999 it was declared a cultural monument of national significance, and in 2008 management of the estate was transferred to the Technical Museum of Slovenia.