This trading route passed the barrier that the Little Carpathians posed via the depression of the valley Bukovská Brázda situated directly below the castle.

In the spring of 1539 Imrich's son, Gáspár Czobor, died and left behind a wife with five children and a substantial debt to the Bakič and Révay magnates families.

[2] The Ostrý Kameň estate was ultimately split at the end of the 18th century due to more marriages, feuds and other transactions.

At the turn of the 15th to the 16th century the safety of the castle was increased by building a bulky fortress in the foreground, on the rock behind the moat.

With the increasing risk of Ottoman raids the Ostrý Kameň castle was expanded with a second forecastle with a circular corner bastion.