Which king, who reassumed the throne upon his son's death, had in his service the Flemish-born military engineer George Prosper Verboom?
Marquis of Verboom: George Prosper Verboom, also known as Jorge Próspero de Verboom (9 January 1665 in Brussels – 19 January 1744 in Barcelona, Spain), was a Flemish-born military engineer in the service of the King of Spain. Marquis of Verboom:  On 9 January 1727, King Philip V of Spain granted him the title of Marquis of 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.
Philip V of Spain