 According to the "Mahavamsa," Tissa, who was thoroughly proficient, at a young age was sought after by the Buddhist monks Siggava and Candavajji for conversion, as they went on their daily alms round.At the age of seven, Tissa was angered when Siggava, a Buddhist monk, occupied his seat in his house and berated him.Siggava responded by asking Tissa a question about the "Cittayamaka" which Tissa was not able to answer, and he expressed a desire to learn the dharma, converting to Buddhism.