Portuguese traders reached Sri Lanka by 1505 where their initial forays were against the south-western coastal Kotte kingdom due to the lucrative monopoly on trade in spices that the Kotte kingdom enjoyed that was also of interest to the Portuguese. The Jaffna kingdom came to the attention of Portuguese officials in Colombo for multiple reasons which included their interference in Roman Catholic missionary activities, (which was assumed to be patronizing Portuguese interests) and their support to anti-Portuguese factions of the Kotte kingdom, such as the chieftains from Sittawaka. The Jaffna Kingdom also functioned as a logistical base for the Kandyan kingdom, located in the central highlands without access to any seaports, as an entrypot for military aid arriving from South India. Further, due to its strategic location, it was feared that the Jaffna kingdom may become a beachhead for the Dutch landings. It was king Cankili I who resisted contacts with the Portuguese and even massacred 600–700 Parava Catholics in the island of Mannar. These Catholics were brought from India to Mannar to take over the lucrative pearl fisheries from the Jaffna kings.