After King Sirimeghavanna’s death a phase of relative stability and prosperity continued up to 428 (or 435 to some wikipedia articles), when Tamil invaders killed King Mittasena and reigned in Anuradhapura for decades. Some of the Sinhalese elites fled to Rohana in the south, from where Dhatusena finally managed to reconquer the Anuradhapura Kingdom and founded the Moriya Dynasty. The previous Lambakanna Dynasty, founded by Vasabha in 67 C.E. saw only one invasion from south India till 429, that led by Abhayanaga, because the more famous events during the Gajabahu events are probably purely legendary. After 429, attacks from India occur frequently.
Of the Lambakanna kings succeeding Sirimeghavanna in the 4th century, Buddhadasa (known as “Bujas” in Sinhala) is worth mentioning as the doctor on the Sinhalese throne. He is credited with having composed a Sanskrit a work on medicin, the Sarartha Sangraha and to have perfomered chirurgical operations himself. Buddhadasa indeed provided dispensaries throughout the kingdom. Providing healthcare for the people was one of the highly appreciated administrational tasks of a meritorious Buddhist king. Buddhadasa ordained that there should be physicians for every ten villages. This is also the first that this administrational unit called Gandahaya is mentioned in Sri Lankan records.
Buddhadasa’s eldest son Upatissa constructed Topa Wewa near Polonnaruwa, which was significantly enlarged by Parakramabahu in the 12th century.
After 429, the Anuradhapura kingdom by Tamil chieftains. Seven of them reigned in succession. Their leader’s name was Pandu, which suggests that he might have been from Madurai, capital of the Pandyan Tamil kingdom. Inscriptional evidence suggests that these rulers were Buddhists and had some support among the locals. Buddhism indeed flourished in the 5th century, because it is this period when the most famoous Thearavada-Buddhist scholar of all times, Buddhaghosa, visited the island and studied in the Mahavihara monastery in Anuradhapura and translated Sinhalese commentaries to the Holy Tipitaka Scriptures into Pali language and wrote his famous systematic compendium of Theravada philosophy, the Visudhimaggha.
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