From then on, the royal families had helped to encourage the spread of Buddhism, aiding Buddhist missionaries and building monasteries. Around 200 BCE, Buddhism became the official religion of Sri Lanka. The Sacred Tooth Relic was brought to Sri Lanka in 4th century by Prince Danta and Princess Hemamala. Sri Lanka has the longest continuous history of Buddhism of any Buddhist nation. During the periods of decline, the Sri Lankan monastic lineage was revived through contacts with Myanmar and Thailand. Later on, however, Hindu invasions and European colonial influences contributed to the decline of Buddhism in Sri Lanka.
