Which king, who reassumed the throne upon his son's death, had in his service the Flemish-born military engineer George Prosper Verboom?
Philip V of Spain Philip V (Spanish: "Felipe V" , French: "Philippe" , Italian: "Filippo" ; 19 December 1683 – 9 July 1746) was King of Spain from 1 November 1700 to 15 January 1724, when he abdicated in favour of his son Louis, and from 6 September 1724, when he reassumed the throne upon his son's death, to his own death 9 July 1746.
Otto of Bavaria Otto (German: "Otto Wilhelm Luitpold Adalbert Waldemar" ; 27 April 1848 – 11 October 1916), was King of Bavaria from 1886 to 1913. However, he never actively reigned due to severe mental illness; his uncle, Luitpold, and cousin, Ludwig, served as regents. Ludwig deposed him in 1913 a day after the legislature passed a law allowing him to do so, becoming king in his own right.