Princess Sasibongse Prabai or Phra Chao Boromwongse Ther Phra Ong Chao Sasibongse Prabai (RTGS: Sasiphong Praphai) () (26 April 1881 – 31 May 1934), was a Princess of Siam (later Thailand. She was a member of Siamese royal family. She is a daughter of Chulalongkorn, King Rama V of Siam.

Her mother was Chao Chom Manda Chan, daughter of Lord (Phraya) Rajasam Bharakorn. Princess Sasibongse Prabai died on 31 May 1934, at the age of 53.

Ancestry +Ancestor of Princess Sasibongse Prabai Princess Sasibongse Prabai Father:Chulalongkorn, King Rama V of Siam Paternal Grandfather:Mongkut, King Rama IV of Siam Paternal Great-grandfather:Buddha Loetla Nabhalai, King Rama II of Siam Paternal Great-grandmother:Queen Sri Suriyendra Paternal Grandmother:Queen Debsirindra Paternal Great-grandfather:Prince Sirivongse, the Prince Matayabidaksa Paternal Great-grandmother:Mom Noi Sirivongs na Ayudhya Mother:Chao Chom Manda Chan Maternal Grandfather:Phraya Rajasam Bharakorn Maternal Great-grandfather:unknown Maternal Great-grandmother:unknown Maternal Grandmother:unknown Maternal Great-grandfather:unknown Maternal Great-grandmother:unknown

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