Juana de Castro

Juana de Castro, called the Unloved (died 1374), was the second wife of Peter I of Castile and half-sister of Inês de Castro. Her father was Pedro Fernández de Castro, and she was a great-granddaughter of Sancho IV. She had a son with her first husband Diego López de Haro.

After his death she met Peter; she demanded he have his marriage to Blanche of Bourbon annulled before she would marry him. Peter complied, and they wed in 1354, but he abandoned her the day after the wedding, leaving her only the castle of Dueñas.

There she gave birth to their son John. She died at Dueñas in 1374 and was buried at Santiago de Compostela.