Abdi-Riša was a ruler-'mayor' of Enišasi, during the period of the Amarna letters correspondence (1350–1335 BC). Another mayor of Enišasi, Šatiya, is found in the Amarna letters corpus. The name "Abdi-Riša" means "servant-Riša". Abdi-Riša is only referenced in his own letter EA 363, a letter to pharaoh, (EA for 'el Amarna'). Letter no. 363 is a unique letter, being part of a letter–series, (by the same scribe): the Amqu being the "Beqaa Valley area" of Lebanon. As letter EA 363 was discovered later, (in a separate in-situ deposit), than the original letters of the Amarna letters correspondence, it is undamaged.

Abdi-Riša letter

EA 363, title: "A joint report on Amqu (4)" The actual written name used for Enišasi in this letter is: Ešasi.