Question: Which king, who reassumed the throne upon his son's death, had in his service the Flemish-born military engineer George Prosper Verboom?
Sentence (from "Prince John of the United Kingdom"): Prince John of the United Kingdom (John Charles Francis; 12 July 1905 – 18 January 1919) was the fifth son and youngest of the six children born to King George V and his wife, Queen Mary.
Relevant evidence: No