Question: What name was given to the son of the man who defeated the usurper Allectus ?
Context: Britannia Prima or Britannia I (Latin for "First Britain") was one of the provinces of the Diocese of "the Britains" created during the Diocletian Reforms at the end of the 3rd century.  It was probably created after the defeat of the usurper Allectus by Constantius Chlorus in  296 and was mentioned in the c. 312 Verona List of the Roman provinces.  Its position and capital remain uncertain, although it was probably located closer to Rome than Britannia II.  At present, most scholars place Britannia I in Wales, Cornwall, and the lands connecting them.  On the basis of a recovered inscription, its capital is now usually placed at Corinium of the Dobunni (Cirencester) but some emendations of the list of bishops attending the 315 Council of Arles would place a provincial capital in Isca (Caerleon) or Deva (Chester), which were known legionary bases. Dranivia was an 18th-century Lauan chief and noble of the Vuanirewa dynasty.  He was the third son of Uluilakeba I and last recorded member of the noble household, Naivi, to hold the title Roko Sau of the Lau Islands.  He is referred to as an usurper and often oral history does not include hims as a Roko Sau.  He is said to have snatched the chieftainship during the absence of his uncle Matawalu from Lakeba, and without the consent of the Vuanirewa.  On hearing of his nephew's treachery, Matawalu returned from Bau and reasserted his authority, while Dranivia was touring the Southern Lau islands.  Dranivia immediately returned to Lakeba which precipitated in kin slaying amongst the Vuanirewa.  Dranivia was defeated and he fled with his supporters to Nayau and establishing the village of Liku. Migapulle Arachchi, also Dom Luis Migapulle Arachchi or Chinna Migapillai, was a rebel leader from the Jaffna Kingdom just after its annexation by the Portuguese Empire in 1619.  Considered to be a son of Periyapillai, he initially began as a pro-Portuguese feudal lord (or "mudaliyar" in Tamil) who opposed the usurper Cankili II but after Cankili's defeat he turned against Portuguese rule.  In March 1620, he invited Thanjavur Nayak king Raghunatha Nayak to send in troops to liberate the territory.  Local people anxious to rid the country of foreigners rose in support.  The rebellion lasted a month and was finally defeated with the arrival of reinforcements from Portuguese holdings in Colombo and Nagapattinam.  Migapulle also led a second rebellion in December 1620 with the help of Khem Nayak, the captain of Raghunatha Nayak and local support.  It was finally defeated in February 1621 by Felipe de Oliveira the captain major of Jaffna.  The rebellion was put down with excessive brutality against the civilian population including mass murder and mutilations. Shuttarna III was a Mitanni king who reigned for a short period in the 14th century BC.  He was the son of Artatama II, an usurper to the throne of Tushratta.  Shuttarna sought support from the Assyrians, but was defeated when a Hittite army marched towards the capital and installed Shattiwaza on the throne. Britannia Secunda or Britannia II (Latin for "Second Britain") was one of the provinces of the Diocese of "the Britains" created during the Diocletian Reforms at the end of the 3rd century.  It was probably created after the defeat of the usurper Allectus by Constantius Chlorus in  296 and was mentioned in the c. 312 Verona List of the Roman provinces.  Its position and capital remain uncertain, although it probably lay further from Rome than Britannia I.  At present, most scholars place Britannia II in Yorkshire and northern England.  If so, its capital would have been Eboracum (York). Constantius I (Latin: "Marcus Flavius Valerius Constantius Herculius Augustus" ; 31 March  250 25 July 306), commonly known as Constantius Chlorus (Greek: Κωνστάντιος Χλωρός , "Kōnstantios Khlōrós", literally "Constantius the Pale"), was "Caesar", a form of Roman co-emperor, from 293 to 306.  He was the father of Constantine the Great and founder of the Constantinian dynasty. Carausius II is the name given by historians to a possible imperial usurper in Roman Britain between the years 354 and 358.  Coins appear during this period bearing the name which is the same as an earlier British usurper emperor, Carausius. Perang Sudarma Wisuta, meaning the war between father and son, is the name given in Javanese chronicles for a 1478 conflict between the rising Demak Sultanate and the waning Majapahit Empire.  It marked the defeat of forces loyal to the Majapahit usurper, Bhre Kertabhumi (Prince Kertabhumi), by Girindrawardhana, son of Singhavikramavardhana, and the independence of the Demak Sultanate under Raden Patah.  1478 is used to date the end of the Majapahit Empire. Flavia Caesariensis (Latin for "The Caesarian province of Flavius"), sometimes known as Britannia Flavia, was one of the provinces of the Diocese of "the Britains" created during the Diocletian Reforms at the end of the 3rd century.  It was probably created after the defeat of the usurper Allectus by Constantius Chlorus in  296 and was mentioned in the c. 312 Verona List of the Roman provinces.  It seems to have been named after Chlorus's family and was probably located beside Maxima Caesariensis, but their positions and capitals remain uncertain.  At present, most scholars place Flavia Caesariensis in the southern Pennines, possibly reaching the Irish Sea and including the lands of the Iceni.  Its capital is sometimes placed at Lindum Colonia (Lincoln). Maxima Caesariensis (Latin for "The Caesarian province of Maximus"), also known as Britannia Maxima, was one of the provinces of the Diocese of "the Britains" created during the Diocletian Reforms at the end of the 3rd century.  It was probably created after the defeat of the usurper Allectus by Constantius Chlorus in  296 and was mentioned in the c. 312 Verona List of the Roman provinces.  Its position and capital remain uncertain, although it was probably adjacent to Flavia Caesariensis.  On the basis of its governor's eventual consular rank, it is now usually considered to have consisted of Augusta or Londinium (London) and southeastern England.
Answer: Constantine the Great