Piyamavadi

Princess Piyamavadi Sri Bajarindra Mata (; ) or Chao Khun Chom Manda Piam () née Piam Sucharitakul (; ) was one of the royal wives of King Mongkut and was of Thai-Chinese descent. 
Her father was the original caretaker of King Mongkut while he ordained, and he passed in the first year of the reign of King Mongkut. Thus H.M. the King patronized his family, bestowed the title Thao (Dame) to his wife, gave her the duties, and sponsored his children.
When her grandson, Crown Prince Maha Vajiravudh (Rama VI) acceded to the throne to be King Vajiravudh, he promoted her as "Princess Piyamavadi Sri Bajarindra Mata" ("meaning": Piam, Princess Mother of Queen Sri Bajarindra).
She had six children with King Mongkut: