Boris, Prince of Tarnovo, Duke in Saxony, known by his Spanish civilian name Boris de Sajonia-Coburgo-Gotha y Ungría, is the elder son of Miriam Ungría y López and Kardam, Prince of Tarnovo, the grandson of former Tsar Simeon II of Bulgaria and, through his mother's second marriage in 2022, the step-son of Prince Ghazi bin Muhammad, a first cousin of King Abdullah II of Jordan.