Exactly how and when the various Anglo-Saxon kingdoms in Britain were founded is something scholars continue to research. Nevertheless, the basic fact that they were founded by Angles, Saxons, and associated Germanic peoples from the continent over the course of the 5th and 6th centuries is well established. However, one modern theory argues that the kingdom of Mercia had a unique origin. Supposedly, it was founded by a late arrival of Vandals from North Africa. What is the basis for this idea, and does it really stand up to scrutiny?What Was the Kingdom of Mercia?Map of Brythonic and Anglo-Saxon kingdoms in the early 6th century. Source: Wikimedia CommonsThe Kingdom of Mercia was, for much of its history, one of the most significant and powerful Germanic kingdoms in Britain. It bordered the Brythonic territory of what is now Wales. The Welsh kingdom of Powys formed its western border, while the Anglian territory of Lindsey and the kingdom of East Anglia were to the east. To the north was probably the Brythonic kingdom of Elmet, before that was conquered by the Northumbrians, while to the south was the Kingdom of Wessex.Over time, Mercia grew much larger. The Mercians were powerful, and their kingdom conquered vast swaths of territory. At its height, it covered a very large portion of what is now England. In some respects, the Kingdom of Mercia differed from the other Germanic kingdoms in Britain. The very fact that they were so powerful has been highlighted as an unusual characteristic by some researchers. For this and other reasons, some researchers have argued that they must have had a unique origin.What Is the Connection Between the Kingdom of Mercia and the Vandals?Sculpture of the Twrch Trwyth and his piglets as described in Culhwch and Olwen, by Tony Woodhams, 2008. Source: Nigel Davies via GeographSpecifically, a theory emerged in the late-20th century that the Vandals were actually responsible for the founding of Mercia. According to this theory, the Vandals arrived in Britain in the mid-6th century and carved out some territory for themselves. This then became the kingdom of Mercia. Aside from the general unusualness of the Mercians in comparison to their Germanic neighbors, what specific arguments are used to support this theory?This theory is based on a story found in the Arthurian tale known as Culhwch and Olwen. This story is set in Arthurs reign, apparently shortly after the Battle of Badon. In this tale, there is a monstrous boar called Twrch Trwyth, which is ravaging Ireland together with its piglets. After Arthur and his men travel to Ireland to defeat it, the boar escapes their clutches and travels to southwest Wales. It then ravages the country across southern Wales before being driven into the Severn from its position just above Glamorgan.Culhwch and Olwen in Jesus College MS 111, folio 202r, showing Osla Gyllellfawr at the end of the fourth line and the beginning of the fifth, c. 1382-1425. Source: Bodleian Library, OxfordSignificantly, one of Arthurs allies in this story is a figure named Osla Gyllellfawr. He appears in other records as a Saxon leader, as his very name suggests. The fact that a Saxon leader is presented as helping Arthur repel the invasion of the Twrch Trwyth from Ireland supposedly indicates that the Trwch Trwyth represents a unique enemy. This suggests that it was an enemy more powerful than the Saxons.This story bears some similarities to an account found in Geoffrey of Monmouths Historia Regum Britanniae, written in c. 1137. He describes how a king from Africa named Gormund attacked the British Isles, first landing in Ireland and ravaging much of that land. He then moved on to Britain itself, devastating the island almost from sea to sea, according to Geoffrey. Given his Germanic name, along with his connection to Africa, it is evident that Gormund is supposed to be a Vandal king. Hence, Geoffrey describes a Vandal invasion of Britain in the 6th century.A Vandal cavalryman depicted on a mosaic found near Carthage, North Africa, c. 500 CE. Source: Wikimedia CommonsHowever, what is the specific connection between this event and the kingdom of Mercia? In the Historia Brittonum, we find a genealogical record of the kings of Mercia. One of them is named Guerdmund. Given the obvious similarity between the names Gormund and Guerdmund, this has been used as evidence for the conclusion that the Vandal invasion in Geoffreys account led to the foundation of Mercia.Since the Vandals were defeated in North Africa in 534, it seems superficially logical that they may have fled and looked for a new home elsewhere. Hence, the fact that there is a record of what appears to be a Vandal invasion of Britain in that very century, during King Arthurs reign, is significant. This is the basis for the idea that the kingdom of Mercia was actually founded by the Vandals. However, when we look at this evidence and these lines of reasoning in more detail, do they really stand up to scrutiny?Is Culhwch and Olwen Really a Description of Gormunds Invasion?Culhwch and Olwen in Jesus College MS 111, folio 209r, showing the death of Osla Gyllellfawr, c. 1382-1425. Source: Bodleian Library, OxfordLet us first consider the issue of the Arthurian tale Culhwch and Olwen. The idea that this refers to an alliance between Arthur and the Saxons to face an even greater threat falls apart upon closer examination. It is true that Osla, a Saxon leader, is presented as Arthurs ally in this story. However, he ends up dying in the pursuit of the monstrous boar. This is notable since Welsh tradition makes Osla the Saxon enemy who Arthur defeated at the Battle of Badon.If Osla died in Culhwch and Olwen, then this story must obviously be set after that battle. As scholar Peter Bartrum pointed out, this evidently means that Culhwch and Olwen is set after Arthur had defeated and subdued Osla at Badon. This means that his appearance in Culhwch and Olwen is not as a reigning allied king but as a defeated and deposed ruler. Hence, there is nothing about this that suggests that the monstrous boar represented some threat that scared the Saxons so much that they allied themselves to the Britons.Map showing Coedkernew in Newport, Wales, a remnant of the region of Cerniw in Gwent. Source: Street MapFurthermore, the idea that this story has anything to do with Geoffrey of Monmouths story of Gormunds Vandal invasion does not stand up to scrutiny. Geoffrey directly places that event in the reign of Ceredic, one of the high kings of Britain after Arthur had already died. This would appear to be the historical Ceredic of Elmet of the late 6th century. In any case, the Vandal invasion definitely occurred after Arthur had died. This does not fit the story in Culhwch and Olwen.Additionally, Geoffrey of Monmouths account makes it clear that Gormund was allied with the Anglo-Saxons of Britain. He even says that Gormund, after his devastating attacks on the country, handed Lloegr (England) over to the Saxons. In contrast, the story of the boar in Culhwch and Olwen states clearly that the boar was driven from Cerniw (either Cornwall or Gwent) and fled into the open sea, never to be seen again.Did Gormunds Supposed Vandal Invasion Really Lead to the Founding of Mercia?Peada of Mercia, son of Penda, depicted on John Speeds Saxon Heptarchy Map, 1611. Source: Cambridge University LibraryWhat about the supposed connection between Gormunds invasion and the founding of Mercia? Even if we dismiss the connection to the story in Culhwch and Olwen set in Arthurs reign, might Gormund nevertheless be identifiable as Guerdmund, the alleged ancestor of the Mercian kings? The reality is that Guerdmund of Mercia in the Historia Brittonum is definitely not identifiable as Geoffreys Gormund, king of the Vandals.According to the Historia Brittonum, Guerdmund was the ancestor of Penda, son of Pybba. This Penda of Mercia is a well-known king, and he was born in c. 606. Notably, the Anglo-Saxon Chronicle provides a fuller version of his ancestry, showing that the version in the Historia Brittonum is significantly abbreviated. The Guerdmund from the Historia Brittonum corresponds to Waermund in the Anglo-Saxon Chronicles version. Based on Pendas estimated date of birth, his ancestor was probably born in the 4th century, long before Geoffreys Gormund. Hence, Gormund, the legendary Vandal king, cannot be Guerdmund, the legendary ancestor of the Mercian kings.Why Mercia Probably Wasnt Founded by the VandalsA coin of Gelimer, the last king of the Vandals known to history, c. 530 CE. Source: Wikimedia CommonsBased on this evidence, what can we conclude? We can see the idea that Mercia was founded by the Vandals is based on a comparison between Culhwch and Olwen, Geoffreys account of Gormunds invasion, and the Historia Brittonum. However, when we examine this evidence more closely, we can see that it does not stand up to scrutiny. There is no evidence that the account of the boar in Culhwch and Olwen represented some greater threat that forced the Saxons to ally themselves with the Britons. Rather, the Saxon Osla was evidently serving Arthur after being defeated at Badon.Furthermore, the details in Geoffreys account about Gormund make it clear that it cannot be identified as the attack of Twrch Trwyth. Even more significantly, while Geoffrey does claim that Vandals invaded Britain in the 6th century, he does not say that they founded Mercia. The supposed connection between Gormund and the legendary ancestor of the Mercian kings, Guerdmund, is impossible for chronological reasons. Therefore, there is really no evidence that the kingdom of Mercia was founded by the Vandals.