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.

Through the conversion of King Tissa and the missionary activity of monks in the villages, by the 2nd century bce the Sinhalese had accepted Buddhism, and this faith helped produce a unity and consciousness on which subsequent political and economic strength was founded. However, it should be recognized that while the monastic chronicles accord the pride of place to Buddhism, other religions also were practiced on the island. Jainism, for instance, probably represented another major religious tradition, and a Jain monastery is mentioned in the Mahavamsa. The chronicle also indicates the presence of Brahmans—Hindus of the highest social rank—in Sri Lanka.

The Anuradhapura period

The Vijaya dynasty of kings continued, with brief interruptions, until 65 ce, when Vasabha, a member of the Lambakanna royal family, founded the Lambakanna dynasty. The Lambakannas ruled for about four centuries. Their most noteworthy king was Mahasena (reigned 276–303), who constructed many major irrigation systems and championed heterodox Buddhist sects.

A Pandyan invasion from southern India put an end to this dynasty and, briefly, to Sinhalese rule in 432. Dhatusena (reigned 459–477) defeated the Pandyas and reestablished Sinhalese rule with the line of Moriya kings. His son Kashyapa I (reigned 477–495) moved the capital from Anuradhapura to the rock fortress of Sigiriya. After Kashyapa’s dethronement the capital was returned to Anuradhapura.

From the 7th century there was an increase in the involvement of south Indian powers in the island’s politics and in the presence of Tamil mercenaries in and around the capital. Manavamma, a Sinhalese royal fugitive, was placed on the throne in 684 with the support of the Pallava rulers of south India.

Manavamma founded the second Lambakanna dynasty, which reigned in Anuradhapura for about 400 years. The dynasty produced a number of distinguished kings, who consolidated and extended Sinhalese political power. During this period, Sinhalese involvement with southern India was even closer. Sinhalese kings were drawn into the dynastic battles between the Pandyas, Pallavas, and Colas. Invasions from south India to Sri Lanka and retaliatory raids were a recurrent phenomenon. In the 10th century the island’s political and military power weakened because of regional particularism and internecine warfare; the Colas—hostile because of the Sinhalese alliance with Pandya—attacked and occupied the Sinhalese kingdom in 993 and annexed Rajarata (in the north-central region of Sri Lanka) as a province of the Cola empire. The conquest was completed in 1017, when the Colas seized the southern province of Ruhuna.

The Polonnaruwa period

The Colas occupied Sri Lanka until 1070, when Vijayabahu liberated the island and reestablished Sinhalese power. He shifted the capital eastward to Polonnaruwa, a city that was easier to defend against south Indian attacks and that controlled the route to Ruhuna. The capital remained there for some 150 years. The most colourful king of the Polonnaruwa period was Parakramabahu I (reigned 1153–86), under whom the kingdom enjoyed its greatest prosperity. He followed a strong foreign policy, dispatching a punitive naval expedition to Myanmar (Burma) and sending the army to invade the Pandyan kingdom; however, these initiatives achieved no permanent success. After Parakramabahu I the throne passed to the Kalinga dynasty, and the influence of south India increased. Nissankamalla (reigned c. 1186–96) was the last effective ruler of this period. The last Polonnaruwa king was Magha (reigned 1215–36), an adventurer from south India who seized power and ruled with severity.

Government and society

Kingship was the unifying political institution in the Anuradhapura and Polonnaruwa periods, a symbol of the aims and achievements of the Sinhalese people. The kingship was essentially Brahmanic (hereditary within the priestly social class), with strong Buddhist influences; all the kings were practicing Buddhists and patrons of Buddhist institutions. The support and blessing of the clergy, moreover, were perceived as essential to a peaceful and continuous reign. This connection between kingship and Buddhism enabled Buddhism to flourish. Kings built, maintained, and endowed many shrines and monasteries, and they intervened to establish order and prevent schism within the Buddhist community. Nobles and commoners too were lavish in their support, and thus Buddhist institutions prospered. Many beautiful temples were built with finely carved sculpture, and monasteries thrived as centres of learning in the Pali and Sinhalese languages and in Buddhist philosophy.

The king was supported by an inner administrative hierarchy consisting of members of his family and influential nobles. The yuvaraja, the king’s chosen heir to the throne, was given responsible office. The army was the major prop of royal absolutism, and the senapati, or commander in chief, was the king’s closest counselor and confidant.

Sinhalese society was segmented into social classes—castes—each of which performed a particular occupation. (The caste system in Sri Lanka, however, was not as rigid as its counterpart in India.) The Govi, or cultivators, made up the highest caste in Sri Lanka, but many other castes also engaged in farming. Administrative officials were drawn from the Govi caste, which was stratified into chiefs, titled men, and peasants. Chiefs were important supporters of royal absolutism and helped administer the government. Nonagricultural people, the Hina, were considered of lower rank and were divided into occupational groups. These caste groups were endogamous; each lived in its own section, along particular streets. Castes were stratified in terms of status, with the lowest on the scale—the candala—performing the most menial of jobs.

The advent and impact of irrigation

The Sinhalese civilization was hydraulic, based on the storage and use of water for the regular cultivation of wet fields. The early Indo-Aryan settlers cultivated rice and settled along river valleys and other suitable lands. They began with simple schemes for damming rivers and storing water below them. Small systems for storing water in reservoirs by tapping seasonal streams later became a feature of nearly every village; these waterworks probably were managed communally by the landowners of the village. With the increase in royal power, the attraction of greater revenue through greater production made kings play an active role in the construction of large-scale irrigation schemes. Beginning about the 1st century ce during the reign of King Vasabha, large perennial rivers were blocked with massive earthen dams to create colossal reservoirs. With increasingly sophisticated irrigation technology, water from these reservoirs was delivered through canals to distant fields and through underground channels to the capital city.

Further technological progress was achieved in the 3rd century during the reign of King Mahasena; a number of storage tanks and canals are attributed to him, the most outstanding of which is the Minneriya tank and its feeder canals. The construction and maintenance of monumental irrigation works became a regular preoccupation of kings. Reservoirs and canals studded the northern and north-central plains, tapping every source of water. Among the most noteworthy was the magnificent Parakrama Samudra in Polonnaruwa, the crowning glory of Parakramabahu I’s reign, with a storage area of more than 5,000 acres (2,000 hectares) for the irrigation of 18,000 acres (7,300 hectares).

Operation of the large works demanded a great deal of coordination and central control; mobilization of labour and technical skill was required at the construction stage, and bureaucratic machinery was essential to keeping the system in repair. Among the primary functions of the central administration was the enforcement of regulations to coordinate cultivation of irrigated plots, to control the flow of water, and to collect water dues from the irrigation operators. Such effective and efficient water management led to increased productivity, which ultimately increased the power of the king.

Many medium and small irrigation works were, however, initiated and managed by regional and village authorities, who became important props of royal authority. When rights to revenue were devolved to these local notables, a feudal system began to emerge, with feudal relations proliferating especially rapidly after 1200.

A grain tax, the water dues, and trade in surplus grain were major sources of the king’s revenue. They sustained strong political and military power for more than a millennium and enabled the dispatch of expeditions abroad. Increased revenue also made possible widespread religious construction, which, along with remarkable accomplishments in the plastic arts and irrigation, was a hallmark of the reign of Parakramabahu I.