Question: Where was the place of death of Ubol Ratana's father?
Sentence (from "Bhumibol Adulyadej"): Reigning since 9 June 1946, he was, at the time of his death, the world's longest-reigning head of state, the longest-reigning monarch in Thai history and the longest-reigning monarch having reigned only as an adult, reigning for 70 years and 126 days.
Relevant evidence: No