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In page Francesca da Rimini:

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Daughter of Guido I da Polenta of Ravenna, Francesca was wedded in or around 1275 to the brave, yet crippled Giovanni Malatesta (also called Gianciotto or "Giovanni the Lame"), son of Malatesta da Verucchio, lord of Rimini.[1] The marriage was a political one; Guido had been at war with the Malatesta family, and the marriage of his daughter to Giovanni was a way to secure the peace that had been negotiated between the Malatesta and the Polenta families. While in Rimini, she fell in love with Giovanni's younger brother, Paolo. Though Paolo, too, was married, they managed to carry on an affair for some ten years, until Giovanni ultimately surprised them in Francesca's bedroom some time between 1283 and 1286, killing them both.[2][3]