Title: Vajiravudh
Content:   Vajiravudh was born on 1 January 1881 to Chulalongkorn and one of his four queens and half sister Saovabha Phongsri. In 1888, upon coming of age, Vajiravudh received the title Krom Khun Thep Dvaravati (Prince of Ayutthaya). Prince Vajiravudh was first educated in the royal palace in Thai and English. His full siblings were Bahurada Manimaya, Tribejrutama Dhamrong, Chakrabongse Bhuvanath, Siriraj Kakudhabhand, Asdang Dejavudh, Chudadhuj Dharadilok and Prajadhipok, who succeeded him as King Rama VII. In 1895, his half-brother Crown Prince Vajirunhis died and Vajiravudh was appointed the new Crown Prince of Siam. In 1898, he continued his education in Britain at the Royal Military College, Sandhurst and was 
Title: Vajiravudh
Content:  Vajiravudh had been a king without a queen for about ten years. In 1920, he met Her Serene Highness Princess Varnvimol at his theatre at Phayathai Palace. They were engaged and Princess Vanbimol was elevated to Her Royal Highness Princess Vallabhadevi. However, four months later in 1921, Vajiravudh nullified the engagement and pursued Princess Vallabha's sister, Princess Lakshamilavan, whom he engaged. However, the marriage was never held and the couple then separated. Princess Vallabha Devi was house-arrested in the Grand Palace from then on. In 1921, Vajiravudh married Prueang Sucharitakul, who was a daughter of Lord Suthammamontri and elevated her to Lady Sucharitsuda. He then married Sucharitsuda's sister, Prabai Sucharitakul, 
Title: Princess Vajira
Content:  Vajira (also called Vajirakumari) was Empress of the Magadha Empire as the principal consort of Emperor Ajatashatru. She was the mother of her husband's successor, Emperor Udayibhadra. Vajira was born a princess of the Kingdom of Kosala and was the daughter of King Pasenadi and Queen Mallika. She was also the niece of her mother-in-law, Empress Kosala Devi, the first wife and chief consort of Emperor Bimbisara and the sister of King Pasenadi.
Title: Vajiravudh
Content:  go to him. If not, the throne would pass to his surviving brother, Prince Prajadhipok of Sukhothai. He barred Princess Inthrasaksachi from being interred with him in the future and instead granted that right to Princess Suvadhana. And Vajiravudh also barred his uncle, Prince Damrong, from the government. On the night of 25 November, Princess Suvadhana gave birth to a princess only two hours before Vajiravudh's death. Vajiravudh glimpsed his sole daughter for the first and only time before his demise on the 26 November 1925. The throne passed to his brother, Prajadhipok, who named Vajiravudh's daughter as Princess Bejaratana.
Title: Vajiravudh
Content:  Vajiravudh (วชิราวุธ,, 1 January 188126 November 1925), was the sixth monarch of Siam (Rama VI) under the Chakri dynasty, ruling from 1910 until his death in 1925. King Vajiravudh is best known for his efforts to create and promote Siamese nationalism. His reign was characterized by Siam's movement further towards democracy and minimal participation in World War I. He had keen interests in Siamese history, archaeology, and literature, as well as economics, politics and world affairs, and founded the country's first university, Chulalongkorn University.
Title: Vajiravudh
Content:  the title of Lady Indrani. In 1922, Lady Indrani was elevated to Princess and Queen Indrasakdisachi. However, the queen suffered two miscarriages. In 1924, Vajiravudh married Krueakaew Abhaiwongse (Later Suvadhana), a daughter of Lord Aphaiphubet. Queen Indrasakdisachi was then demoted to Princess Consort in 1925. Vajiravudh had only one child, a daughter with Suvadhana, Princess Bejaratana Rajasuda (เพชรรัตนราชสุดา; 1925-2011). In his influential book Imagined Communities Anglo-Irish political scientist and historian Benedict Anderson speculated that the king was homosexual and that this would prevent him from accession if the law of succession was not reformed. Anderson was the first modern scholar to break the taboo and write about king's personal preferences.
Title: Vajiravudh
Content:  In 1924, Vajiravudh promulgated his Law of Succession, which has since become the code for Chakri dynasty successions. According to the law, the throne would be passed to the king's sons and grandsons. However, in the case of Vajiravudh who had no sons, the throne would pass to his eldest "true" or full brother, that is, a brother who shared both the same father and mother, Queen Saovabha. The law gave priority to the descendants of princes born to Queen Saovabha, then to Queen Savang Vadhana, and then to Queen Sukumalmarsri. The law also forbade princes whose mother was foreign from the throne. This referred to his companion, Prince Chakrabongse, who had married a Russian woman. His son, Prince Chula Chakrabongse, was therefore barred from the throne.
Title: Princess Vajira
Content:  Vajira or Vajirakumari was born to Pasenadi's chief queen, Mallika. According to Pali tradition, her mother was a beautiful daughter of the chief garland maker of Kosala. When the princess was born, her father was apparently disappointed on hearing the child was a girl, but Buddha assured him that some women were wiser than men.
Title: Vajirananavarorasa
Content:  Vajirañana was the 47th child of King Mongkut. He was born in the Grand Palace as the fourth child of Phae, one of King Mongkut's concubines. She died after giving birth to her fifth child, a daughter, when he was one year old. He was then fostered by a maternal relative, Princess Varaseṭhasutā or "Putrī", a daughter of King Rama III, and her mother, a royal concubine named Samaśakti or "Ueng". In the palace, he was taught the Siamese alphabet by a woman, Nok Panakngan. The nobleman Phraya Pariyatidharrmadhātā or "Piam" (then called Luang Rājābhirama), deputy head of the Royal Pundits Department, came to 
Title: Saovabha Phongsri
Content:  Sri Bajarindra (ศรีพัชรินทรา; ; 1 January 1864 – 20 October 1919) – also known as Saovabha Phongsri (เสาวภาผ่องศรี; (Pronunciation)) –  was an agnatic half-sister and consort of King Chulalongkorn (Rama V) of Thailand, and mother of both King Vajiravudh (Rama VI) and King Prajadhipok (Rama VII). As in accordance with Thai royal tradition, King Vajiravudh later bestowed on his mother the title of "Queen Mother Sri Bajrindra".

Question: Who is the mother of Vajiravudh?
Answer: Saovabha Phongsri.