Keladi Shivappa Nayaka Fort (ಕೋಟೆ)
Shivappa Nayaka (ಶಿವಪ್ಪ ನಾಯಕ) (r.1645–1660), popularly known as Keladi Shivappa Nayaka, was a notable ruler of the Keladi Nayaka Kingdom. The Keladi Nayakas were from Veerashaiva Lingayath Community and successors of the Vijayanagara Empire in the coastal and Malnad (hill) districts of Karnataka, India, in the late 16th century.
At their peak, the Nayakas built a niche kingdom comprising the coastal, hill and some interior districts (Bayaluseeme) of modern Karnataka, before succumbing to the Kingdom of Mysore in 1763, which at that time was ruled by Hyder Ali. He was known as Sistina Shivappa Nayaka because he introduced a tax system called Sist.
Shivappa Nayaka is remembered as an able administrator and soldier. He ascended the throne in 1645. During this time, the last ruler of the diminished Vijayanagara Empire ruling from Vellore, Shriranga Raya III was defeated by the Bijapur Sultanate and sought refuge with Shivappa.
The growing threat of the Portuguese was eliminated by 1653 and the ports of Mangalore, Kundapura and Honnavar were brought under Keladi control.
 Having conquered the Kannada coast, he marched down to Kasargod region of modern Kerala and installed a pillar of victory at Nileshvara. The forts of Chandragiri, Bekal and Mangalore were built by Shivappa Nayaka.
Later he invaded north of the Tungabhadra river and captured territory in the modern Dharwad district from the Bijapur Sultanate. In the south, when he invaded and laid siege to Srirangapatna in modern Mysore district, an epidemic broke out in his army forcing him the withdraw. In the south, he destroyed the Portuguese political power in the Kanara region by capturing all the Portuguese forts of the coastal region.