According to Sinhalese tradition, Buddhism was first brought to Sri Lanka by a mission sent out from eastern India during the reign of the Mauryan emperor Ashoka (c. 273–232 bce). The leader of the mission to Sri Lanka, Mahendra (Mahinda), is described as Ashoka’s son. Mahendra and his colleagues traveled to the Mihintale hill (the site of some of the earliest inscriptions), 8 miles (13 km) from Anuradhapura. There they chanced to meet the Sinhalese king Tissa, to whom they delivered a sermon on Buddhism. The king was brought into the Buddhist fold, and he invited Mahendra and his followers to the city. The missionaries were settled in a royal pavilion in the city park of Mahamegha, where they preached first to members of the royal family and then to the common people. Many embraced the new religion, some taking holy orders and joining the Buddhist sangha (community of monks). The king donated the Mahamegha park to the sangha. Meanwhile, the monastery of Mahavihara was established, and it became the prime centre of Buddhism in Sri Lanka. Mahendra sent for his sister Sanghamitta, who arrived with a branch of the Bo tree (at Bodh Gaya), under which the Buddha had attained enlightenment. The sapling was ceremonially planted in the city. Sanghamitta founded an order of nuns, and a stupa (shrine), the Thuparamacetiya, was built by the king for popular worship. Thus, with the founding of these and other institutions, Buddhism became an established religion in Sri Lanka.