Saovabha was born as a Princess of Siam to King Mongkut (or Rama IV) and Princess Consort Piyamavadi (Piam Sucharitakul). She was the youngest sister of the future Queen Sunandha Kumariratana and Queen Savang Vadhana.
The passage describes Saovabha's royal lineage, highlighting her position as the youngest daughter of King Mongkut and Princess Piyamavadi, and her connection to future queens Sunandha Kumariratana and Savang Vadhana.