The history of Sadashivagada Fort is intertwined with the rise and fall of various empires. It is believed to have been initially built by the Sonda rulers and later came under the control of the Portuguese in the 16th century. The fort witnessed numerous battles between the Portuguese and local rulers, including the Marathas and the Nayaks of Bednore. In the 18th century, Hyder Ali of Mysore captured the fort, renaming it 'Nazarbad.' The fort played a crucial role in controlling the sea trade and defending the region from invaders. After the fall of Tipu Sultan, the fort came under British control. Over time, with changing strategic needs, the fort lost its importance and gradually fell into disrepair.