During the reign of King Vajiravudh, two of his full brothers, Prince Chudadhuj Dharadilok and Prince Asdang Dejavudh died in 1923 and 1925 respectively. Another brother and heir presumptive, Prince Chakrabongse Bhuvanath died in 1920 not long after divorcing his Russian wife, Katya. Their only son, Prince Chula Chakrabongse, was excluded from the succession because his mother was a foreigner under Section 11 (4) of the 1924 Palace Law. While Prince Varananda Dhavaj, only son of Prince Chudadhuj Dharadilok from a morganatic union, was considered, by royal discretion, ineligible to the throne.