The vampire Armand / by Anne Rice.

Enhanced descriptions from Syndetics:

In the latest installment of The Vampire Chronicles, Anne Rice summons up dazzling worlds to bring us the story of Armand--eternally young, with the face of a Botticelli angel. Armand, who first appeared in all his dark glory more than twenty years ago in the now-classic Interview with the Vampire , the first of The Vampire Chronicles, the novel that established its author worldwide as a magnificent storyteller and creator of magical realms.
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Now, we go with Armand across the centuries to the Kiev Rus of his boyhood--a ruined city under Mongol dominion--and to ancient Constantinople, where Tartar raiders sell him into slavery. And in a magnificent palazzo in the Venice of the Renaissance we see him emotionally and intellectually in thrall to the great vampire Marius, who masquerades among humankind as a mysterious, reclusive painter and who will bestow upon Armand the gift of vampiric blood.
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As the novel races to its climax, moving through scenes of luxury and elegance, of ambush, fire, and devil worship to nineteenth-century Paris and today's New Orleans, we see its eternally vulnerable and romantic hero forced to choose between his twilight immortality and the salvation of his immortal soul.