Dom Cosmo Wijayasekara of Brahmanawatte Balapitiya was a Portuguese captain who fought alongside the Portuguese. However, at Randeniwela he with his salagama army joined the Sinhala King and ke supposedly killed the Portuguese governor who was fighting valiantly. After the war King Senarath provided Dom Cosmo with several nindagams and gave him Katugaha Walauwa to use as his residence.
He did not have any male offspring. His daughter married (Binna) from a famous family in the area and Keppetipola Dissawa is a direct descendant of his.