Panakaduwa copper plate is a Sri Lankan copper plate made at the request of King Vijayabahu I for a high-ranking general called Budalna (Sithnarubim Buddhanayake (Budalnavan), Dandanayake of Ruhuna). The main reason for this to be inscribed on the plate is the aid that was given by him to juvenile prince Kirthi (Vijayabahu I) and his family during his pre-regnal days from the Cholas. The king triumphed over the Chola ruler (he defeated the army led by Lokissara to secure his kingdom in Kacharagama (Katharagama, Magama)) and victoriously led his army to mainland India. It was apparently completed around 1082-83 in the 27th year of his reign. This copper plate can be considered as the world's oldest thank you note in the recorded history.