Wikipedia
Abdi-Riša
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):
EA 174-(1), "Report on Amqu (1)" EA 175-(2), "Report on Amqu (2)" EA 176-(3), "Report on Amqu (3)" EA 363-(4), "Report on Amqu (4)"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.