Princess Orathai Thepkanya (1859 - 1906) was a daughter of King Mongkut (Rama IV) and one his Royal Concubines who was a commoner.
The Princess was born with poor health. Through her life, she had always been sick and that made her despaired.
Anyway, it turned her to religion, Buddhism, and became a very strict one. She hoped that it would ward off her sickness somehow.
All through her life, she had donated regularly to build things for public’s uses such as building a bridge across a klong for people and being a head of various kinds of religious events.
In the photo shows the Princess, as the head of the construction of a big pond which was named ‘Sa (= pond) Orathai’ (1905), for general use inside the Grand Palace, hearing a report of the event.
(A computer colored version; smaller photo shows the pond today)