Jetavana Stupa, Built as the main feature of the Jetavana monastery during the reign of King Mahasena (272- 303 A.D.). has subsequently undergone various renovations and developments during the reigns of Kings such as Mitsen , Mahanaga, Dhatusena, Agbo I , Mugalan III , etc.
This was also the tallest brick monument in the world at the time Mahavansa mentions that when the stupa was last renovated by King Parakramabahu the Great (1153 â€“ 1186 A.D.). It was 160 ancient cubits (120 meters) high. The stupa as it stands now is 73 meters high up to its broken spire. This stupa , which was covered by think vegetation with the fall of the Rajarata civilization, was party excavated and conserved by the British administration during the second half of the 19th century and thereafter by the Archaeological Department. Since 1981, archaeological research and consecration work are being carried out by the Central Cultural Fund.