Christians recognize two archangels named within the canon of their scriptures: Gabriel and Michael. Catholic and Eastern Orthodox Christians also recognize Raphael from the deuterocanonical Book of Tobit. The non-canonical Book of Enoch names several more archangels but these are not officially recognized by most Christian churches.
The Book of Enoch and Jewish tradition also name Uriel and Jeremiel.
St. Thomas Aquinas, using St. Paul and St. Denis as sources, divided the angels into three hierarchies each containing three orders: the highest consists of the Seraphim, Cherubim and Thrones; the second of Dominations, Virtues and Powers; and the third of Principalities, Archangels and Angels. According to the Bible, God sends angels and archangels to deliver messages to mankind.