The Angiris Council is a tome found in Act IV of Diablo III, specifically within the 1st tier of the Gardens of Hope.
It reads as follows:
The Angiris Council is comprised of the five archangels who hold dominion over the High Heavens. They determine the laws by which all angels must abide. Each of them embodies a pure aspect of creation: valor, justice, hope, fate and wisdom. - Selathiel, Angiris Scribe