Wikipedia
Maha Vajirunhis, Crown Prince of Siam (; ; 27 June 1878 – 4 January 1895) was the first Crown Prince of the Chakri Dynasty. He was the first son of King Chulalongkorn and Queen Savang Vadhana.
In 1886, after the death of the last Vice King Bovorn Vichaichan, King Chulalongkorn chose not to appoint one of his brothers as a new Vice King, but instead appointed his eldest son as the Crown Prince of Siam. On January 14, 1886, he was officially introduced to his position with the title of Sayam Makutrajakuman, or Crown Prince of Siam. A bright and handsome child, the Prince died unexpectedly of typhoid fever at age 16, long before he could reach the throne. King Chulalongkorn's second son, Prince Vajiravudh, was then named crown prince, and succeeded him as Rama VI in 1910.
The King built the Prince his own palace, nicknamed Windsor Palace. The European-style palace was demolished after his death. The site is currently the National Stadium of Thailand.