The name Uriel — Hebrew Uri'el — means "God is my light" or "flame of God" (from ur, fire/light, and El, God). Where Michael's name is a question and Gabriel's a declaration of strength, Uriel's name is a declaration of illumination — not the communication of light (Gabriel's domain) but its very substance. Uriel is the archangel of divine fire in its most essential form: the light that illuminates what is hidden, the flame that burns away what is false.
Uriel appears by name in 1 Enoch and in 2 Esdras (4 Ezra) — the Jewish apocalyptic text in which he serves as interpreter of visions for the prophet Ezra, in a role closely paralleling Gabriel's role with Daniel. He is named as one of the four angels of the divine presence in multiple Jewish texts, consistently associated with light, fire, repentance and the earth. In the Life of Adam and Eve he is the angel who guards Eden's gate with the flaming sword — the cherub of Genesis 3:24 given a name.
The Council of Rome's demotion of Uriel in 745 CE is one of the more fascinating episodes in the history of angelology. Pope Zachary's concern was not that Uriel was false but that the proliferation of named angels was leading to uncontrolled popular cults. Several other angels were demoted at the same time. The Catholic Church has never officially condemned Uriel — he simply ceased to appear in the approved list of three archangels (Michael, Gabriel, Raphael). The Eastern Orthodox and Ethiopian churches never accepted this demotion and continue to venerate all four.