What is "sundem"

Sundem was a feudal state that existed in the Indian state of Goa. The kings were called 'Sonda Raja' or 'Soundekar Raja'. They were feudatory vassals at various times to the Vijayanagara Empire, Maratha Empire and the Bijapur Sultanate. Finally they became vassals of the Portuguese Empire. They were called the 'Rei de Sundem' in Portuguese.