Their existence was taken for granted by the biblical authors. The use of the word angel may have been a way of describing what was believed to be an appearance of God himself in human form. They either have no body or one that is only apparent. New Testament statements about angels reflect Jewish views of these beings. During the Middle Ages, theologians developed a hierarchy of angels.
Angels are a popular subject in folklore, literature, and art.
There are also angels that govern the days of the week and , months of the year. I don't know where these beliefs originated, but I am sure sometime in the early history of man. Following is a list of the angels for each month of the year. Each angel is also believed to govern a day together with a planet. The angel Ambriel is associated with Gemini.