The Maran Castle is a relic from the Parthian era. It is said that Maran is the same second capital of the Parthians which was constructed by Tirdad. It is the vicinity where Yazidebne Mahlab slayed thousands of people.
Mohammad Hassan Khan-e-Jalayer took refuge in Maran castle after the war with Iranian central government, and was trapped by a person known as Haji. The Maran Kooh area around the castle was rendered to Haji thus named Hajilar.