Calderon, the Courtier is a historical romance set in the court of Philip III of Spain. The novel centers around the character of Calderon, a courtier who navigates the intricate and often perilous politics of the Spanish court.

The story delves into themes of power, ambition, and intrigue, portraying the complexities of court life and the personal struggles of its protagonist. Bulwer-Lytton's detailed and dramatic narrative brings to life the historical setting and the various figures within it, providing readers with a vivid depiction of early 17th century Spain.

Calderon, the Courtier showcases Bulwer-Lytton's talent for historical fiction and his ability to weave together rich character development with historical detail.