He fell in love with María Teles de Meneses (c. 1338, CoimbraNovember 1379, Coimbra), a redheaded beauty about eleven years older than he, who was lady-in-waiting to the Infanta Beatrice and sister of Queen Leonor Teles. María was the widow (circa 1360) of Álvaro Dias de Sousa (1365), 2nd Lord of Mafra and Ericeira, by whom she had conceived Lopo Dias de Sousa ( – 1435, Pombal), who inherited his father's titles and later became Master of the Order of Christ. Infante John, having gone to her house to fetch her, found an altar and a priest waiting; María had made the preparations for their wedding. Thus the marriage was performed secretly in 1376, and when it became public knowledge, it provoked the wrath of Leonor Teles. Upon the death of Ferdinand I with no male heir, the people might demand the crowning of the beloved Infante John as king, which would raise his wife to the throne, with grave consequences to herself (Leonora), hated as she was by the Portuguese people.