The Lumbarda Psephisma (Croatian: Lumbardska psefizma), also known as Lumbardian Decree, is an ancient Greek stone inscription dating from the 3rd or 4th century BC.

According to the document, the Issans established their settlement based on a prior agreement with two representatives of local Illyrians named Pyllos and his son Dazos: "During the time of the Hieromnemon Praxidamos, in the Machanemus month, the contract about the founding of the settlement was drawn up between the people from Issa and Pyllos and his son Dazos.

[2] The stone inscription was discovered on top of a hill called Koludrt, and it is believed that this is where the Issan town most likely once stood.

Its significance is in that it confirms that ancient Illyrians lived on the island of Korčula, and also offers insight into the way Greeks set up colonies and trading outposts throughout Dalmatia.

[5] Archeological finds are numerous, including carved marble tombstones, ceramics and foundations of Greek villas.