Blood and Gold (Vampire Chronicles #8) by Anne Rice

The Vampire Chronicles continue as the great vampire Marius returns. The golden-haired Marius, true Child of the Millennia, once mentor to The Vampire Lestat, reveals in his own intense yet intimate voice the secrets of his two-thousand-year existence.

Once a proud Senator in Imperial Rome, kidnapped and made a "blood god" by the Druids, Marius becomes the embittered protector of Akasha and Enkil, Queen and King of the vampires. We follow him through the fall of pagan Rome, the sack of the Eternal City, glittering Constantinople, and the Renaissance in Florence, all the way to a dramatic finale in our own time.