Sinhala. Their Achievements include the construction of the largest reservoirs and dams of the ancient world as well as enormous pyramid-like stupa (dāgaba in Sinhala) architecture. This phase of Sri Lankan culture may have seen the introduction of early Buddhism. Early history recorded in Buddhist scriptures refers to three visits by the Buddha to the island to see the Naga Kings, snakes that can take the form of a human at will. The earliest surviving chronicles from the island, the Dipavamsa and the Mahavamsa, say that Yakkhas, Nagas, Rakkhas and Devas inhabited the island prior to the migration of Indo Aryans. Pre-Anuradhapura period (543–377 BCE) Indo-Aryan syncretism The Pali chronicles, the Dipavamsa, Mahavamsa, Thupavamsa and the Chulavamsa, as well as a large collection of stone inscriptions, the Indian Epigraphical records, the Burmese versions of the chronicles etc., provide information on the history of Sri Lanka from about the 6th century BCE. The Mahavamsa, written around 400 CE by the monk Mahanama, using the Deepavamsa, the Attakatha and other written sources available to him, correlates well with Indian histories of the period. Indeed, Emperor Ashoka's reign is recorded in the Mahavamsa. The Mahavamsa account of the period prior to Asoka's coronation, 218 years after the Buddha's death, seems to be part legend. Proper historical records begin with the arrival of Vijaya and his 700 followers from Vanga. A detailed description of the dynastic accounts from Vijaya's time is provided in the Mahavamsa. H. W. Codrington puts it, 'It is possible and even probable that Vijaya ('The Conqueror') himself is a composite character combining in his person...two conquests' of ancient Sri Lanka. Vijaya is an Indian prince, the eldest son of King Sinhabahu ("Man with Lion arms") and his sister Queen Sinhasivali. Both these Sinhalese leaders were born of a mythical union between a lion and a human princess. The Mahavamsa states that Vijaya landed on the same day as the death of the Buddha (See Geiger's preface to Mahavamsa). The story of Vijaya and Kuveni (the local reigning queen) is reminiscent of Greek legend and may have a common source in ancient Proto-Indo-European folk tales. According to the Mahavamsa, Vijaya landed on Sri Lanka near Mahathitha (Manthota or Mannar), and named on the island of Tambaparni ("copper-colored sand"). This name is attested to in Ptolemy's map of the ancient world. The Mahavamsa also describes the Buddha visiting Sri Lanka three times.