The following marriages shall be void from the beginning:
(1) Those contracted under the ages of sixteen and fourteen years by the male and female respectively, even with the consent of the parents;
(2) Those solemnized by any person not legally authorized to perform marriages;
(3) Those solemnized without a marriage license, save marriages of exceptional character;
(4) Bigamous or polygamous marriages not falling under article 83, number 2;
(5) Incestuous marriages mentioned in article 81;
(6) Those where one or both contracting parties have been found guilty of the killing of the spouse of either of them;
(7) Those between stepbrothers and stepsisters and other marriages specified in article 82. (n)