At the end of his regency, Si Suriyawonse was raised to Somdet Chao Phraya, the highest title the nobility could attain. Si Suriyawongse himself was the most powerful noble of the 19th century. His family, Bunnag, was a powerful one of a Persian descent dominating the Siamese politics since the reign of Rama I. Chulalongkorn then married four of his half-sisters. They were all the daughters of Mongkut – Savang Vadhana, Saovabha, and Sunandha with Concubine Piam and Sukumalmarsri with Concubine Samli.