The Portuguese explorer Vasco da Gama discovered the sea route to India in 1498, and thereafter Portugal built up a sizable colonial empire in Asia. While it was eventually eclipsed by other European powers, Portugal continued to rule Goa and the enclaves of Daman and Diu till 1961 - when these territories were liberated by the Indian armed forces. Thus, Portugal's colonial rule in India lasted longer than that of any other colonial power.
From 1668 to 1958, the Rupia was the currency of Portuguese territories. Under the Anglo-Portuguese treaty of 1878, coins for Portuguese territories in India were henceforth minted in the Calcutta mint of British India. The Una Rupia of Portuguese India was the same as 1 Indian Rupee. In 1958, the Rupia was replaced by the Escudo, at the rate of 1 Rupee = 6 Escudos. Decimal coinage was also adopted together with the Escudo.