The Real Barenziah is an unauthorized biography of the famous Queen Mother of Morrowind. It is collected in a series of volumes, written by an unknown author. This first volume begins on the day of Barenziah’s birth, told from the perspective of a dark elf called Symmachus. It then moves on to a chronicling of the early years of Barenziah’s life.
Volume 1 can be found by the dragonborn in:
Drelas’ Cottage, upstairs on a shelf
Lost Knife Hideout, on a bookshelf just before the cages
Players with the Dawnguard DLC may also find it in:
Volkihar Ruins, on a shelf
Reading by David Pickering (@Akaagentshades)