Refernces to the Grigori can be found throughout biblical literature. They are referred to in the Book of Daniel(4:13, 4:17, 4:23) as the Watchers or Holy Ones . Nebuchadnezzar II uses the term first to describe an experience he has with such a being within one of his dreams. The Greek word 'egrgoroi' , meaning 'watcher', appears in both the Book of Jubilees(Jub. 3:15, 5:1) and the Book of Lamentations. It appears again in Old Testament pseudepigrapha, such as the Book of Enoch. The Book of Enoch, which is not accepted by all Jews or Christians, is said to be written by Enoch, who is the great-grandfather of Noah. Throughout the Dead Sea Scrolls, Arabic writing and fragments of irin we-qadishin are found. This phrase, similar in nature to the previous ones, means "Watchers and Holy Ones". Irin , meaning Watcher, is a term often viewed as similar to the Greek word for Angel.
The story of the Grigori begins as a derivative from the 6th chapter of Genesis in the first section of Enoch: The Book of the Watchers. ( This takes place shortly the well-known Fall when Morning Star fell) . It goes into length describing the Sons of God and the offspring they bore.- though later theology deemed the Sons of God as meaning the descendants of Cain, rather than any other being . The Grigori are described as angels with human characteristics and traits. They were created to go to Earth and watch over humanity in an effort to protect it without interfering. They were most suited for this task, as their traits allowed them to blend in and interact with humans on a level that other angels could not. They had many of the same emotions humans did, which granted them the ability to understand them far more than any other. They spent all of their time on Earth with humans, and the interaction between the two eventually led to their corruptibility and their becoming too human for their own good.
Here are some names of the leaders that ruled the Grigori:
" These are the names of their chiefs: Samyaza, who was their leader, Urakabarameel, Akibeel, Tamiel, Ramuel, Danel, Azkeel, Saraknyal, Asael, Armers, Batraal, Anane, Zavebe, Samsaveel, Ertael, Turel, Yomyael, Azazyel (also known as Azazel). These were the prefects of the two hundred angels, and the remainder were all with them ." (1Enoch 7:9)
It became apparent that the Grigori had begun to bond too closely with humans. They taught them forbidden knowledge and crafts that otherwise would have taken long to develop, such as weaponry and sorcery. They started to love and lust after women, and procreate with them. Their offspring were brutal, and violent giants called the Nephilim . Their destructive tendencies were a constant endangerment to humans and God decides that the sins of man and the sins of the Grigori are high, and decrees a Great Flood. This ties into the well-known story of the flood, as Noah is warned by the angel Uriel of the impending doom so that he may save his family and thus preserve the human race. Genesis 6:4 tells us that the Nephilim remain, even after the flood, and other stories indicate that the Grigori were bound into the Earth to await their fate on Judgment Day and are thusly considered to be Fallen Angels.
Book of Daniel
Book of Enoch
Book of Lamentation
Book of Jubilees