King Dutugemunu's most famous creation was the Ruwanweliseya, also known as the Great Stupa or and Swarnamalee Chetiya, to house the begging bowl of the Buddha. The construction was started on the full moon day of the month of Vesak (traditionally the date of the birth, enlightenment, and passing away of the Buddha) with the creation of a foundation of crushed rock. To hammer the stones into place elephants were used with their feet bound in leather [18]. Dutugemunu is said to have overseen the work personally, being present at the construction of the relic chamber and the interring of the bowl itself. The dedication of a stupa is described in Chap. 29 of the Mahavamsa, which lists the visit of delegations from various parts of India, as well as a delegation of 30,000 monks from Alexandria of the Caucasus, led by the Indo-Greek monk Mahadharmaraksita.
(Source: Wikipedia.org)