He is thought to be the last monarch to establish himself at Polonnaruwa, which was chosen as the capital of Sri Lanka by Sinhalese kings over a period of for 430 years from time to time.
Chronicles stated that he is a son of King Vijayabhahu who was assassinated in 1270 and after the death of King Buvanekabhahu he was crowned immediately. But Mahavansa said that after the death of Buvanekabhahu I Sri Lanka faced a huge feminine invasion from the Pandyan kingdom.
That invasion happened under the command of King Kulasekhara (A.D.1268-A.D.1308) and was done by a minister under him called Arya Cakravarthi.it was stated in Pandyan scripture in A.D.1305 and it tells that he invaded Yapahwa and took the Tooth Relic of The Buddha to their country.
So there can be said that king Parakramabhahu faced heavy problems at the moment on the sitting throne. So there could conclude that after solving the majority of problems he had taken the throne officially after a coronation. This can show by a Tamil poem called Sarajoti Malai which was recited at King Parakramabhahu III in May A.D.1310 which was the seventh year after his coronation. Then it can be said his reign was started in A.D.1302 or A.D.1303. In the meantime can be taken as a turbulent period in Sri Lanka. It can also be said that a large part of Sri Lanka has become part of the Pandyan Empire.
In this period, for the protection of Tooth and Bowl Relic China which was under the rule of the Yuan dynasty had sent an envoy to the Pandyan court in 1284. Also, a famous traveller Marco Polo came to Sri Lanka between y1292 and 1294. His records stated that a king named Sendamain whose identity was unknown.
Anyway, king Parakramabhahu III was succeeded in taking back Tooth Relic to the country and taking his capital as Polonnaruwa
to rule the country. For taking back the Tooth relic he had to humble himself by representing himself at the Pandyan court as an envoy. It can also take as he becomes vassal of Pandyan empire.
However, it was unfortunate that his reign range was unknown in history. There was said his cousin Buvanekabhahu who was the son of Buvanekabhahu usurped the throne by sending his barber to the blind king. After that taking the throne king Buvanekabhahu change capital to Kurunagala.
