The castle of Zlenice was founded after 1300 on a rocky promontory, below which the Mnichovický Brook flows into the Sázava River. The name Zlenice is first mentioned in 1318, when Oldřich of Zlenice is mentioned. The castle was named after the extinct settlement of Zlenice, which lay on the other bank of the Sázava. However, the foundation of the castle in its present form can be definitely placed in the first half of the 14th century.