Hurrian language
Among the richest sources is the material from the Hittite archives of the Hittite capital of Hattusa, which is partially composed of Hurrian language texts and partially of Hurrian works translated into the Hittite language. Several Hurrian ritual texts survive from Ugarit, there are also references to Hurrian gods in some Akkadian sources from that city. The Amarna letters from King Tushratta of Mitanni and the treaty documents provide evidence about the Hurrian-influenced religion practiced in the Mitanni kingdom. The archives of individual Syrian cities, like Emar, Mari and Alalakh, also contain Hurrian texts. The evidence from eastern Hurrians is comparatively rare, though documents from Nuzi allude to distinct customs such as ancestor worship and maintaining sacred groves.