Urubongs Rajsombhoj was the Prince of Siam (later Thailand). After his death on King Chulalongkorn's birthday, at the age of 15, which brought sadness to the members of the Royal Family, King Chulalongkorn ordered the building of a bridge in the city with sculptures of Prince Urubongs set into both sides. This bridge was eventually demolished but Urubongs Road and Urubongs Intersection remain today.
He was a son of King Chulalongkorn of Siam. His mother was daughter of Lord (Phra) Narindrabhorn and Prik Niyavananda, the Noble Consort (Chao Chom Manda) Luean Niyavananda. His elder sister, Princess Lavad Voraong, died in infancy.
As a child Urubongs Rajsombhoj joined his father’s trips to many places, including Europe. Urubongs was not educated in Europe like the other princes, but instead received instruction from foreign teachers at a private residence in Siam.