Satan
Becoming the First "Fallen Angel"
Satan was Initially the greatest and most powerful Angel Created by God in Heaven, or in the Universe! Sadly though, Satan began to become overconfident and prideful of his own Given Glories, enough to begin to view his own Glories and power upon the same par' as God !
Even to begin to believe himself able to do the same things as God with equal ability in Creativity and success!
With this view of himself, so too did Satan choose to use God's Creation of 'Children' to begin to seek avenues by which he could both prove and expound his own glories and power even above God's Own! Thus began Satan's fall from God's 'Grace'
In the Folly of sin!!!
How Satan's Fall Took Place In Not Being God Satan's Folly The Result