Ave Maria!
“When God created the angels, He put them to the test in order that they may freely choose to submit themselves to His will in everything or not, and He revealed the future to them, that is, His intention to give life to a creature without stain of sin, immaculate, but who would be a human being, and would also become their Queen, and they, according to His will, would have to render homage to Her. But there was a part of the angels who considered such a thing to be a humiliation to their perfection. They rebelled against the will of God and, with Lucifer leading the way, were cast into Hell.” (SK #1293)