In 1425, at age 12, Frederick was betrothed to Princess Jadwiga of Lithuania; but she died on 8 December, 1431, before the marriage could take place.
Frederick was betrothed to Princess Jadwiga of Lithuania. This was at age 12. This was in 1425. She died on 8 December. This was in 1425. The marriage could take place.8 December was 1431.