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The Book of Urizen is one of the major prophetic books of the English writer William Blake, illustrated by Blake's own plates. It was originally published as The First Book of Urizen in 1794. Later editions dropped the "First". The book takes its name from the character Urizen in Blake's mythology, who represents alienated reason as the source of oppression. The book describes Urizen as the "primeaval priest" and narrates how he became separated from the other Eternals to create his own alienated and enslaving realm of religious dogma. Los and Enitharmon create a space within Urizen's fallen universe to give birth to their son Orc, the spirit of revolution and freedom.
In form the book is a parody of the Book of Genesis. Urizen's first four sons are Thiriel, Utha, Grodna and Fuzon (respectively elemental Air, Water, Earth, Fire, according to Chapter VIII). The last of these plays a major role in The Book of Ahania, published in 1795.

The Book of Ahania is one of the English poet William Blake's prophetic books. It was published in 1795, illustrated by Blake's own plates.

The poem of the book consists of six chapters. The content concerns Fuzon, a son of Urizen, a Zoa or major aspect in Blake's mythology. Ahania of the title is Urizen's female counterpart.

The Book of Los is a 1795 prophetic book by the English poet and painter William Blake. It exists in only one copy, now held by The British Museum. The book is related to the Book of Urizen and to the Continental prophecies; it is essentially a retelling of Urizen from the point of view of Los. The book has been described as a rewriting of the ancient myth of creation that equates fall with the loss of spiritual vision brought about by selfhood.
Background

During autumn 1790, Blake moved to Lambeth, Surrey. He had a studio at the new house that he used while writing what were later called his "Lambeth Books", which included The Book of Los in 1795. Like the others under the title, all aspects of the work, including the composition of the designs, the printing of them, the colouring of them, and the selling of them, happened at his home. The Book of Los was one of the few works that Blake describes as "illuminated printing", one of his colour printed works with the coloured ink being placed on the copperplate before being printed.

Both The Book of Los and The Book of Ahania were the same size, produced at the same time, and were probably etched on opposing sides of the same copper-plates. Both works were the only ones by Blake to have intaglio etchings instead of relief etchings. Likewise, both works were colour-printed, where the various coloured inks were directly applied to the etching instead of added in later.
(Wikipedia)