Cyril of Jerusalem's proposed theology of the Trinity has been labeled generic. That is, the term “God” identifies not so much a species of being or an individual being, but a unique, sui generis genus. Within the genus of God there are three species or ways of being God, though not three discrete individual beings. The article will attempt to defend and renew Cyril's theology by an appeal to the contemporary philosopher, Saul Kripke, and his notion of rigid designators. One way to contemporize and perhaps better understand Cyril's position is to interpret the term “God” as a Kripkean natural kind rigid designator with the properties of Fatherhood, Sonship, and Spiration.