Lord Kalvan of Otherwhen

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Lord Kalvan of Otherwhen is a 1965 science fiction novel by American writer H. Beam Piper. It is part of the Paratime series about secret travel between parallel worlds. John F. Carr later expanded the book into the Kalvan series, with some installments co-written by Carr and others. The story was published after Piper’s death.

Corporal Calvin Morrison of the Pennsylvania State Police is accidentally sent to an alternate North America that looks like a Renaissance-era world of many small kingdoms. He befriends Prince Ptosphes of Hostigos and falls in love with Ptosphes’s daughter Rylla. Using his knowledge of chemistry, Morrison begins making gunpowder and improves weapons, helping Hostigos defend itself against its neighbors Nostor, Sask, and Beshta. He also helps spread the know-how of gunpowder, challenging the priests of Styphon’s House who control the powder monopoly. A Paratime Police agent, Verkan Vall, follows Morrison but grows to like him and helps keep his secret.

Morrison becomes known as Lord Kalvan and eventually the Great King Kalvan of Hos-Hostigos, with Rylla as queen. He wins battles, unites the region, and weakens Styphon’s power as other princes join him. The archpriest of Styphon and Kaiphranos of Nostor oppose him, but Kalvan’s new realm endures. The book sets up a larger Kalvan saga that continues in later novels by Green and Carr. The story also raises the question of whether one extraordinary person can change history.