Soṇa is one of the pair of missionary elders whom Moggaliputta Tissa sent to Suvaṇṇabhūmi, the Golden Land, in the reign of Ashoka to establish the religion after the Third Council. In the legend the theras arrived to find a sea-demoness devouring every newborn child; they countered her with the recitation of the Brahmajāla Sutta and won the country to the Dhamma. Mon tradition and the fifteenth-century Kalyāṇī Inscriptions of King Dhammazedi locate this Suvaṇṇabhūmi at Thaton, giving the Mon a claim to the oldest Theravada foundation in the region, though the identification remains debated among historians.