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'Rajarata was an administrative region in ancient Sri Lanka. It was centered around the ancient cities of Tambapanni, Upatissa Nuwara, Anuradhapura and Polonnaruwa. Rajarata was under the direct administration of the King. Other areas (Malaya rata, Ruhunu rata) were ruled by the King's brothers, called "Mapa" and "Epa". The Magha invasion in the 13th century brought about the end of the Rajarata kingdom. 
"Rajarata" means "the area of the King" since "Raja" means King and "Rata" means area. Thus, the region of Sri Lanka in which these monarchs ruled was called Rajarata.
History and Kingdoms
The first kingdom in Rajarata was established by Prince Vijaya in 543 BC. He settled near the delta of the Malvathu River between Chilaw and Mannar. Local myth claims that Prince Vijaya married a local princess Kuveni to gain control of Rajarata. With her help, he betrayed and killed all the regional leaders. After his death, the administrative center was moved to the countryside along the Malvathu Oya. The river was ideal for agriculture. The first three administrative centers (Tambapanni, Upatissa Nuwara, Anuradhapura) were situated close to the Malvathu Oya. King Pandukabhaya, once a prince descended from local Yaksha and Sinha tribes, was able to form a stable kingdom in Anuradhapura. He garnered support from tribes in different areas of the island.
Administrative centers in Rajarata:
- Tambapanni - Prince Vijaya - Founded in 543 BC
- Upatissa Nuwara - Founded by King Upatissa in 505 BC
- Anuradhapura - Founded by King Pandukabhaya in 377 BC
- Sigiriya - Built by King Kashyapa (477 – 495 CE), but after the death of the king center moved to Anuradhapura
- Polonnaruwa - Founded by King Vijayabahu I
Prince Vijaya and his clan settled in Tambapanni, near the Malvatu Oya delta. Mahavamsa reveals that successive settlements by various groups came from India in the period between Prince Vijaya and King Pandukabhaya, and often settled along the Malvathu Oya. In 377 BC, King Pandukabhaya moved the administrative center to Anuradhapura. Most of the settlements were located near rivers and rain water reservoirs to support an agricultural lifestyle. Yodha wewa area in Mannar District by King Dhatusena, Eropathana in Vavuniya District, Padawiya area in Anuradhapura District and Mullaitivu District by King Moggallana II says that the extent of Sri Lanka's golden civilization spread all the wat to the southern boundary of the Vanni forest. The thick Vanni forest acted as a huge barrier to colonizers above the southern border of the forest. Tanks built during the Anuradhapura era (Giant's, Padaviya, Minneriya, Kantale, Mahavillachchiya,Thabbowa,Kala) is proof of the early settlements in Rajarata area.
Initial settlements based near rivers:
- Malvathu oya - Anuradhapura, Upatissa nuwara, Tambapanni
- Mahaweli river - Pollonnaruwa
- Deduru oya - Sigiriya, Yapahuwa
Boundaries of Rajarata
Boundaries of the three divisions (Rata):
- Raja rata - Area between Deduru oya and the Mahaweli river
- Ruhunu rata - Area between the Mahaweli river and Kalu gaga
- Malaya rata - Area between Deduru oya and Kalu gaga
Fall of Rajarata
In 1215 Kalinga Magha invaded Rajarata with an army of 24,000. After the conquest of Rajarata, Magha established his capital in Pollonnaruwa. Then Kalinga forces extended power to the Malaya Rata. During the rise of Kingdom of Dambadeniya under the king Vijayabahu III (1220- 1224 AC), Magha lost the control in Malaya Rata. Resistance was extended from natives to the Magha's administration at Pollonnaruwa. Sinhalese gathered around a series of inaccessible towns, fortresses, mountainous like Yapahuwa and Gangadoni under army generals (Subha, Sankha etc.). Due to rising threat, Pandyan troops established an administration center in Jaffna Peninsula which was more secured by heavy Vanni forest. Later Rajarata was annexed by king Parakramabahu II(1236–70). His power extended over Rohana, the central hills, Rajarata and the Vanni . Sinhalese tried to re-establish the administrative center in Rajarata, but many battles happened in the country with the armies from south India under different invaders, and the administration center was moved away from Rajarata by Sinhalese. But the Pandyan defeat in South India was weaken the Tamil power in Sri Lanka. The last Pandyan ruler of Madurai, was defeated and expelled in 1323 by Malik Kafur, the army general of the Muslim empire Delhi Sultanate. The falling of Pandyan was a very significant history event to Sri Lanka.
It leads to following events:
- Military rulers "Aryacakravarti" - who was appointed as minister of Pandyan empire - made the Jaffna administrative center independent from Pandyans and established Jaffna kingdom and Arya Chakrawarthi dynasty.
- The Tamil lost power in the Vanni and they withdrew from Vanni to Jafna Peninsula. Population was very low in this area until British starting Tamil Colonization south to Parantan.
- Area below Vanni forest stabilized under Sinhala Kingdom
Also, ancient Rajarata (before the 13th century) was divided into three parts:
- Jaffna kingdom - Jaffna peninsula. This was ruled by the Arya Chakrawarthi dynasty.
- Rajarata - Area below the Vanni. This area was ruled by the Sinhalese kingdoms.
- Vanni Area - Area which covers the Vanni forest, abandoned area between Sinhala Kingdom and Jafna Kingdom
- "A series by Gaveshaka in association with Studio Times". The Sunday Times (Sri Lanka). Retrieved 27 May 2014.
- The Island
- Padaviya: the Eastern Capital of the Rajarata Kingdom
- Sunday Times
- Vijaya married Kuveni, won kingdom
- A tale of two nation
- The Mahávansi, the Rájá-ratnácari, and the Rájá-vali. Parbury, Allen, and Co. 1833.
- Yoda Wewa - Mannar District amazinglanka.com
- The Sri Lanka Reader History, Culture, Politics by John Clifford Holt, Robin Kirk, Orin Starn page 55
- Short History of Ceylon By Humphrey William Codrington page 2
- A history of Sri Lanka by K. M. De Silva Page 82
- The History of Sri Lanka By Patrick Peebles page 31
- A History of Sri Lanka K.M. De Silva, p. 64.