First mentioning of mansion Brdo was in 1436 as hof zu Ekch in Krain. In the year 1515 the mansion, then owned by noble Lambergs, was severly damaged by peasant resistance.
Heraldic inscription panel above the castle portal testifies of how in 1552 Janez and Andrej of Lamberg levelled down the old damaged building and built completely new one which gained a character of fortified renaissance mansion. Incription continues, that work was completed by Janez's son, Andrej of Črnel and Jabelj.
Lambergs were owners of mansion until 1622 and were followed by leaseholder Anton Petschauitz and then Hans Taller which later became owner of the mansion. After his death the mansion was inherited by Janez Ludvik count Hohenwart and in 1670 he sold the mansion to Feridnand Ernest baron Apfaltrer. In the mid-18^th century ownership of the mansion went back to Lambergs. Janez Burger becomes owner of the mansion in 1803 and in 1883 owner becomes Slovenian notary and writer Janko Kersnik which was supposedly also born at the mansion. In the wall in the south-western tower a commemorative plaque dedicated to him was embedded in 1937 and renewed in 1952, at the centenary of his birth.
Brdo was once proud of its well managed park surroundings. A chestnut avenue which still exists today led to the mansion from the west. Directly related to the entrance of the castle there is a pond, a stone table, park plantation with domestic trees, etc...

Mansion Brdo is slowly being reconstructed by company "Gradbeno podjetje Bežigrad". The facility, unfortunately, is despite reconstruction unstoppably falling apart. Walking inside the mansion is dangerous, somewhere even impossible because the walls are still collapsing despite being held together by metal rods. Let me also mention than Ivan Stopar classifies Brdo as a mansion and Ivan Jakič agrees to classification of Brdo as a castle.