Prabai Bannabilas was the Princess of Siam (Thailand) and a member of Siamese Royal Family under Chakri Dynasty. She suffered from her terrible illness and died on 17 September 1886, at the age of only 1 year and 1 month.
Princess Prabai Bannabilas is a daughter of King Rama V of Siam, Chulalongkorn and daughter of Phraya Phitsanuloka Thibodi, Chao Chom Manda Phrom. She had 3 siblings; 1 elder sister, 1 younger brother and 1 younger sister namely Princess Prabha Bannabilaya (her twin sister), Prince Samaya Vudhirodom, and Princess Vapi Busbakara. Princess Prabha Bannabilaya and Princess Prabai Bannabilas were the only twin couple of King Chulalongkorn and they were the 4th twin couple in Chakri Dynasty.