The castle and its lordship are mentioned in period documents under various names, including Los, Louse, Lose, and Lösch.
In 1269 a "gastald" or administrator was first mentioned; his functions would have been economic-administrative, supervisory and judicial, being in particular responsible for the proper collection of duties and taxes.
In 1342, the Patriarchate gave the castle with all attendant rights and its provincial judiciary in fief to Herman and George Werdenstain, who the same year sold it all to the house of Ortenburg.
In the second half of the 16th and early 17th centuries, Lož Castle and lordship were held by (from 1574) Charles George the noble Hoffer, Erasmus Börse, Franc Šajer, and the brothers Christopher and Francis Moškon.
Its decay accelerated after the lordships of Lož, Snežnik and Postojna were bought by Count Janez Vajkard Turjak (Auersperg) in 1669.