On the final day of the Rains retreat in 1868, Rama IV passed away. His eldest son, Prince Chulalongkorn, who was now Rama V, was only fifteen years old. As a result, the running of the government was placed in the hands of a Regent — Chao Phraya Sri Suriyawong (Chuang Bunnag) — who was to hold this office until Rama V reached maturity. (In a later reminiscence, Rama V stated that during this period he lived in constant fear of being assassinated.) Shortly after the Regency was instituted, Somdet Toh — who was now 80 — appeared at the Regent's palace in the middle of a sunny day, carrying a lit torch that he held aloft with one hand, and a long, narrow palm-leaf Dhamma text that he carried at a backward-sloping angle under his other arm. After he had walked through the palace halls in this way, word reached the Regent. The Regent respectfully approached Somdet Toh and asked him to take a seat, after which he assured him that he understood the Somdet's message: He would not allow his deliberations to be overcome with the darkness of defilement, and he would hold to the Dhamma as a rudder while steering the ship of state.
Four years later Somdet Toh passed away.