His period is known for the treaties which made Thanjavur subordinate to the British East India Company.

In 1771, Thuljaji invaded the dominion of the Polygar of Ramnad who had wrested Hanumantagudi from Thanjavur during the reign of Pratapsingh.

[1] The Nawab and the East India company laid siege to Tanjore, and forced the Raj to surrender.

A humiliating treaty was forced upon the Raja and was later ratified by the officials of the British East India Company.

Arni and Hanumantagudi were taken from the Raja's hands and Thanjavur was to have the same foreign policy as the kingdom of the Nawab.

[2] In 1776, the Board of Directors of the British East India Company ordered the restoration of Thuljaji.

[4] Kuppana wrote classics such as Acharyavijayamu, Panchanada Sthalapurana, Yakshaganas of Ramayana and the Bhagavata, Parana Bhagavatacharitra, Indumati Parinaya and Karmavipaka.