The Maharaja Soma Shah was Koli ruler of the petty kingdom of Ramnagar, present days in Gujarat.
[1][2] It was started by Maharaja of Ramnagar when Portuguese possessed the Daman and Diu and was an annual tax nominally levied at 25% on revenue or produce, hence the name.
[1][3] The British Indian historian Jadunath Sarkar states that there were several disputes between petty kingdom of Jawhar and the kingdom of Ramnagar in 1670 after the treaty between Raja Vikram Shah Mukne (Vikramrao) of Jawhar and Portuguese Captain Fernao De Miranda of Daman and Diu.
[1][4] Jadunath Sarkar wrote that, after the failure of the treaty with Jawhar State, Portuguese Captain Fernao De Miranda went to the Maratha Emperor 'Chhatrapati Shivaji' of Maratha Empire and persuaded him to destroy the Koli countries of Jawhar and Ramnagar and to get ride of protection fees.
After some time, the Portuguese did not pay because Chhatrapati Shivaji had not conquered the entirety of Empire of Maharaja Som Shah.