Ferdinand I of Portugal
Pedro de Menezes was the grandson of the powerful 14th-century nobleman João Afonso Telo, 1st Count of Ourém, 1st Count of Viana do Alentejo, and 4th Count of Barcelos, and his wife Maior Portocarrero y Silva, lady of Vila Real. Pedro was the cousin of Leonor Teles, the scandalous but powerful consort of King Ferdinand I of Portugal.