Saovabha Phongsri (Thai: เสาวภาผ่องศรี; RTGS: Saowapha Phongsi (Pronunciation)) was an agnatic half-sister, royal wife and queen 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" (Thai: ศรีพัชรินทร; RTGS: Si Phatcharin).

Quick Facts Queen consort of Siam, Tenure ...

Saovabha Phongsri
Queen Saovabha Phongsri, Regent of Siam Queen Mother Sri Bajarindra
Queen consort of Siam
Tenure	1878 – 23 October 1910
Born	Phra Chao Luk Thoe Phra Ong Chao Saovabha Phongsri (1861-01-01)1 January 1861 Grand Palace, Bangkok, Siam
Died	20 October 1919(1919-10-20) (aged 58) Grand Palace, Bangkok, Siam
Spouse	Chulalongkorn (Rama V)
Issue	Bahurada Manimaya Vajiravudh (Rama VI) Tribejrutama Dhamrong Chakrabongse Bhuvanath Siriraj Kakudhabhand Asdang Dejavudh Chudadhut Dharadilok Prajadhipok (Rama VII)
House	Chakri dynasty
Father	Mongkut (Rama IV)
Mother	Piam Sucharitakul

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Saovabha was born as a Princess of Siam to King Mongkut (or Rama IV) and Princess Consort Piyamavadi (Piam Sucharitakul). She was the youngest sister of the future Queen Sunandha Kumariratana and Queen Savang Vadhana. Saovabha became the consort of her half-brother King Chulalongkorn sometime in 1878. She gave him 9 children, 5 would survive to adulthood (one died in infancy), two would eventually become King of Siam.

In 1897, Queen Saovabha became the first female Regent of Siam, when her husband went on a tour of Europe. When he returned he bestowed upon her the title of "Somdet Phra Nang Chao Saowapha Phongsi Praborommarachininat" (RTGS) (Thai: สมเด็จพระนางเจ้าเสาวภาผ่องศรี พระบรมราชินีนาถ) (roughly equivalent to H.M. the Queen Regent). During her time as queen, she took many interests, especially in the issues concerning women. In 1904 she established one of the first schools for girls in Siam; the "Rajini School" or Queen's School in Bangkok.

When she died in 1919 at the age of 58, she was given a grand Royal Funeral, attended by all members of the Siamese Royal Family, and the ceremony was presided over by her son King Vajiravudh. She played a prominent posthumous role in the 1924 Palace Law of Succession, in which her son King Vajiravudh stipulated that her children would take precedent among all others over the line of succession. This guaranteed the accession of her youngest son Prince Prajadhipok to the throne in 1925, despite there being more senior and learned sons of Chulalongkorn. The Queen Saovabha Memorial Institute was named after her.

She had 9 children with King Chulalongkorn:

In addition, the queen also adopted one of Savang Vadhana's daughters, Princess Valaya Alongkorn and raised as her own daughter.

• 1924 Palace Law of Succession
• Savang Vadhana
• Chulalongkorn
• Vajiravudh
• Prajadhipok

• The Thai Redcross Society (English)
• The Queen Saovabha Memorial Institute