Question: Which king, who reassumed the throne upon his son's death, had in his service the Flemish-born military engineer George Prosper Verboom?
Context: In Greek mythology, Thyestes (pronounced , , ] ) was the son of Pelops and Hippodamia.  He was a king of Olympia and father of Pelopia and Aegisthus.  Thyestes and his brother, Atreus, were exiled by their father for having murdered their half-brother, Chrysippus, in their desire for the throne of Olympia.  They took refuge in Mycenae, where they ascended the throne upon the absence of King Eurystheus, who was fighting the Heracleidae.  Eurystheus had meant for their lordship to be temporary; it became permanent because of his death in conflict. 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.  At the time of John's birth, his father was the Prince of Wales and heir apparent to the reigning monarch of the United Kingdom, Edward VII.  In 1910, George succeeded to the throne upon Edward's death and John became the fifth in line of succession. Andriantsitakatrandriana was the king of Imerina from 1630 to 1650, acceding to the throne upon the death of his father, Andrianjaka.  He took two wives: the first, Ravololontsimitovy, gave birth to his first son and successor Andriantsimitoviaminandriandehibe, while his second wife, Rafoloarivo, gave birth to a son named Andriamanjakatokana.  During his reign, he chased his second wife and son from his territory, and constructed dikes to transform the Betsimitatatra swamps around Antananarivo into vast rice paddies to feed the local population. Wideok of Baekje (525–598) (r. 554–598) was the 27th king of Baekje, one of the Three Kingdoms of Korea.  He was the eldest son of King Seong, and rose to the throne upon his father's death. King Seocheon of Goguryeo (died 292, r. 270–292) was the 13th ruler of Goguryeo, the northernmost of the Three Kingdoms of Korea.  He was the second son of King Jungcheon, and was confirmed as Crown Prince in 255.  He ascended the throne upon his father's death in 270.  In the first lunar month of 271, he married Usu, the daughter of the daesaja of Seo-bu, to be his queen. 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.  On 9 January 1727, King Philip V of Spain granted him the title of Marquis of Verboom. Ha' K'in Xook (] ), also known as Ruler 6, was an "ajaw" of Piedras Negras, an ancient Maya settlement in Guatemala.  He ruled during the Late Classic Period, from 767–780 AD.  Ha' K'in Xook was a son of Itzam K'an Ahk II, and he ascended the throne upon the death of his brother, Yo'nal Ahk III.  Ha' K'in Xook's reign seems to have ended either with his death or his abdication in favor of his brother K'inich Yat Ahk II; archaeologists and Mayanists have not come to a clear consensus on this.  Ha' K'in Xook left behind several monuments, including stelae at Piedras Negras and a stone fragment from El Porvenir.  In addition, a stone seat known as Throne 1 which was erected by K'inich Yat Ahk II, records either the death or abdication of Ha' K'in Xook. 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. He was the eldest son of Kabaka Ttembo Kiridde, Kabaka of Buganda, by his wife, Najjemba.  He ascended to the throne upon the death of his father, around 1434.  He established his capital at Kitala Hill.  In 1464, he abdicated the throne in favor of his son, Ntege Kiyimba.  Kiggala resumed the throne after the death of his son, sometime around 1484.  He went blind shortly after the beginning of his second reign.  He ruled under the regency of his prime ministers. A queen consort is the wife of a reigning king (or an empress consort in the case of an emperor).  In Brunei, the wife of the Sultan is known as a "Raja Isteri" with prefix "Pengiran Anak", equivalent with queen consort in English, as were the consorts of tsars when Bulgaria was still a monarchy.  A queen consort usually shares her husband's social rank and status.  She holds the feminine equivalent of the king's monarchical titles, but historically, she does not share the king's political and military powers.  A queen regnant is a queen in her own right with all the powers of a monarch, who (usually) has become queen by inheriting the throne upon the death of the previous monarch.
Answer: Philip V of Spain