Trollope's first major success came with "The Warden" (1855)—the first of six novels set in the fictional county of "Barsetshire" (often collectively referred to as the "Chronicles of Barsetshire"), dealing primarily with the clergy and landed gentry. "Barchester Towers" (1857) has probably become the best-known of these. Trollope's other major series, the Palliser novels, which overlap with the Barsetshire novels, concerned itself with politics, with the wealthy, industrious Plantagenet Palliser (later Duke of Omnium) and his delightfully spontaneous, even richer wife Lady Glencora featured prominently, though, as with the Barsetshire series, many other well-developed characters populated each novel and in one, "The Eustace Diamonds", the Pallisers play only a small role.