Fics like And love is more cruel than lust

When two invading armies rout the forces of Britain, Arthur Pendragon, King of Britain, can only rue his misfortune when he's forced to escape to the continent. Until he’s taken captive by Roman soldiers in the Pale of Calais, far, far north of their lord’s domains. But for all his notoriously bloodthirsty and cruel reputation, Lucius Tiberius, Emperor of Rome, is not ungenerous towards his royal hostage: he offers Arthur men and supplies to recapture and save his kingdom. If Arthur would only consent to marry him and become his consort. While fending off the emperor’s unwanted attention during captivity, he comes to learn that the invasion and kidnapping were all part of something much bigger. The truth behind the alliance between the two armies, who was behind it, and for how long and how deep Lucius’ obsession for him has run… A tale of a marriage, an unexpected love, and the end of an age.

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