The recorded history of Sri Lanka begins with the arrival of Prince Vijaya from northern India around 543 BCE, according to the Mahavamsa chronicle compiled by Buddhist monks in the 5th and 6th centuries CE. Vijaya landed on the western coast with 700 followers and established the first Sinhalese kingdom. While the Mahavamsa presents this as historical fact, modern scholars debate whether Vijaya was a single historical figure or represents a synthesis of multiple migration waves from the Indian subcontinent. Archaeological evidence confirms human habitation in Sri Lanka dating back at least 125,000 years, with the Balangoda Man representing prehistoric inhabitants. The indigenous Vedda people, numbering approximately 2,500 today, are considered descendants of these original populations predating the Vijayan arrival.
The most transformative event in Sri Lankan history occurred in the 3rd century BCE when King Devanampiya Tissa converted to Buddhism after meeting Arahat Mahinda, son of the Indian Emperor Ashoka. The Mahavamsa records this conversion as occurring in 247 BCE, though some scholars place it slightly later. Mahinda arrived in Mihintale, eight miles from Anuradhapura, where he encountered the king during a hunting expedition. Sanghamitta Theri, Mahinda's sister, arrived subsequently bringing a sapling from the Bodhi tree under which the Buddha attained enlightenment. This sapling was planted at Anuradhapura and became the Jaya Sri Maha Bodhi, which remains alive today as the oldest authenticated tree in the world with a planting date of 288 BCE. Buddhism became the state religion and shaped every subsequent aspect of Sinhalese civilization including governance, architecture, agriculture, and social organization.
King Dutugemunu's military campaign against the Tamil king Elara in the 2nd century BCE represents the first major ethnic conflict documented in the chronicles. Dutugemunu ruled from 161 to 137 BCE and unified the island under Sinhalese Buddhist rule after defeating Elara, who had governed the northern region for 44 years. The Mahavamsa portrays this as a religious war to restore Buddhism, though modern historians note both kings were Buddhist and the conflict was fundamentally territorial. Dutugemunu constructed the Ruwanwelisaya stupa in Anuradhapura, which originally stood 300 feet tall with a circumference of 950 feet. The chronicles record that 12,000 monks attended its dedication ceremony. This period established the pattern of Anuradhapura as the political and religious capital, a status it maintained for over 1,400 years.
The arrival of the Sacred Tooth Relic of the Buddha in the 4th century CE elevated Sri Lanka's religious significance throughout the Buddhist world. Princess Hemamali and her husband Prince Dantha smuggled the relic from Kalinga in eastern India around 310 CE, hiding it in the princess's hair to escape Hindu persecution. The tooth was first enshrined at Anuradhapura, then moved through various capitals as political power shifted. Possession of the relic became synonymous with legitimacy to rule, establishing the principle that whoever controlled the tooth controlled the kingdom. Portuguese forces claimed to have captured and destroyed the relic in 1560 in Goa, but Sinhalese sources maintain this was a replica and the authentic relic remained hidden. The tooth currently resides in the Temple of the Sacred Tooth Relic in Kandy, where it has been housed since the kingdom of Kandy became the final independent Sinhalese kingdom in 1592.
King Kashyapa I's construction of Sigiriya between 477 and 495 CE represents both architectural achievement and political paranoia. Kashyapa seized power by immuring his father King Dhatusena alive in a wall and forcing him to reveal the location of hidden treasures. Fearing revenge from his brother Moggallana, the rightful heir, Kashyapa built a fortress palace atop a 660-foot granite rock in the central Dry Zone. The complex included the Mirror Wall, plastered and polished to such smoothness that the king could see his reflection, and frescoes of celestial maidens numbering perhaps 500 originally, of which 21 survive today. The Lion Gate, where visitors passed through a lion's mouth carved from stone with only the paws remaining today, gave the site its name Sinhagiri or Lion Rock. After 18 years, Moggallana returned with an army from southern India. During the ensuing battle, Kashyapa's elephant turned toward a water tank, his troops interpreted this as retreat and fled, and Kashyapa slit his own throat. Moggallana razed much of the palace and established a Buddhist monastery at the site, which functioned until the 14th century.
The reign of King Parakramabahu I from 1153 to 1186 CE marks the zenith of Polonnaruwa as the island's capital and the peak of medieval Sinhalese hydraulic civilization. Parakramabahu declared that not one drop of water should reach the ocean without serving human purposes. He constructed or restored 165 dams, 3,910 canals, 163 major tanks, and the Parakrama Samudra, an artificial reservoir covering 6,000 acres that still irrigates paddy fields today. The capital at Polonnaruwa housed an estimated 100,000 inhabitants at its height. Parakramabahu unified the three kingdoms that had fragmented Sri Lanka and briefly invaded southern India and Burma. He convened the Third Buddhist Council at Polonnaruwa in 1165 to purify the Sangha and standardize doctrine. The king's statue carved in rock at Polonnaruwa, though some scholars argue it depicts the sage Agastya, shows a bearded figure holding a yoke or book, with an inscription reading "May the rain fall at the proper time, may the harvests be bountiful, may the kingdom prosper." After Parakramabahu's death, the irrigation system fell into disrepair as invasions from southern India destabilized successive kingdoms.
The abandonment of the great northern capitals occurred gradually between the 13th and 15th centuries due to repeated invasions from the Pandyan and Chola dynasties of southern India and the spread of malaria in the Dry Zone as irrigation systems collapsed. The Rajarata civilization that had sustained populations in the north for 1,500 years ended. The Sinhalese kingdoms retreated to the southwestern Wet Zone, with Kotte near present-day Colombo becoming the dominant kingdom by the 15th century. Tamil populations from southern India, arriving as invaders, traders, and settlers over many centuries, established the independent Kingdom of Jaffna in the northern peninsula by the 13th century. The Aryacakravarti dynasty ruled Jaffna until Portuguese conquest in 1619. This period established the demographic pattern still visible today, with predominantly Tamil populations in the northern and eastern regions and predominantly Sinhalese populations in the south and central regions.
Portuguese arrival in 1505 initiated three and a half centuries of European colonialism that fractured the island into competing zones of control. The Portuguese explorer Lourenço de Almeida landed at Galle after being blown off course en route to the Maldives. The Portuguese established fortified trading posts at Colombo, Galle, Jaffna, and Trincomalee, seeking to monopolize the cinnamon trade that grew wild in the southwestern forests. By 1597, the Portuguese controlled most coastal regions but never conquered the Kingdom of Kandy in the central highlands. Portuguese missionaries converted substantial populations to Catholicism, particularly among the Karava fishing caste along the western and southern coasts and among Tamil populations in the Jaffna peninsula and the northwestern coast. The Portuguese language influenced Sinhalese and Tamil, contributing words like messa for table, iskole for school, and batthara for butter. Portuguese forces destroyed thousands of Buddhist and Hindu temples and confiscated lands belonging to monasteries, creating lasting resentment that complicated later Christian missionary efforts.