 Last in line would have been Prince Paribatra Sukhumbandhu, only son of Queen Sukhumala Malasri, although this was unlikely given he had been exiled in the Siamese revolution of 1932.The law based on the principle of male primogeniture, with first in line being the eldest son of the previous monarch and second in line being the next-oldest son, and so on.The law expressly ruled against women ascending the throne (this clause was abrogated in the 1997 Constitution).