The Mercian Supremacy was the period of

Anglo-Saxon The Anglo-Saxons were a Cultural identity, cultural group who inhabited England in the Early Middle Ages. They traced their origins to settlers who came to Britain from mainland Europe in the 5th century. However, the ethnogenesis of the Anglo- ...

history between c. 716 and c. 825, when the kingdom of

Mercia la, Merciorum regnum , conventional_long_name=Kingdom of Mercia , common_name=Mercia , status=Kingdom , status_text=Independent kingdom (527–879)Client state of Wessex () , life_span=527–918 , era=Heptarchy , event_start= , date_start= , ye ...

dominated the Anglo-Saxon

Heptarchy The Heptarchy were the seven petty kingdoms of Anglo-Saxon England that flourished from the Anglo-Saxon settlement of Britain in the 5th century until they were consolidated in the 8th century into the four kingdoms of Mercia, Northumbria, Wess ...

England England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe b ...

Sir Frank Stenton Sir Frank Merry Stenton, FBA (17 May 1880 – 15 September 1967) was an English historian of Anglo-Saxon England, and president of the Royal Historical Society (1937–1945). The son of Henry Stenton of Southwell, Nottinghamshire, he was educ ...

apparently coined the phrase, arguing that

Offa of Mercia Offa (died 29 July 796 AD) was List of monarchs of Mercia, King of Mercia, a kingdom of History of Anglo-Saxon England, Anglo-Saxon England, from 757 until his death. The son of Thingfrith and a descendant of Eowa of Mercia, Eowa, Offa came to ...

, who ruled 757–796, effectively achieved the unification of England south of the

Humber The Humber is a large tidal estuary on the east coast of Northern England. It is formed at Trent Falls, Faxfleet, by the confluence of the tidal rivers Ouse and Trent. From there to the North Sea, it forms part of the boundary between th ...

estuary. Scholastic opinion on the relationship between the kingdoms of

Wessex la, Regnum Occidentalium Saxonum , conventional_long_name = Kingdom of the West Saxons , common_name = Wessex , image_map = Southern British Isles 9th century.svg , map_caption = S ...

and Mercia at this time remains divided. While the precise period during which the Mercian Supremacy existed remains uncertain – depending upon whether one includes the reigns of

Penda Penda (died 15 November 655)Manuscript A of the ''Anglo-Saxon Chronicle'' gives the year as 655. Bede also gives the year as 655 and specifies a date, 15 November. R. L. Poole (''Studies in Chronology and History'', 1934) put forward the theor ...

(c. 626–655) and

Wulfhere Wulfhere or Wulfar (died 675) was King of Mercia from 658 until 675 AD. He was the first Christian king of all of Mercia, though it is not known when or how he converted from Anglo-Saxon paganism. His accession marked the end of Oswiu of North ...

(658–675) – the end of the era is generally agreed to be around 825, following the defeat of King Beornwulf at the

Battle of Ellandun The Battle of Ellendun or Battle of Wroughton was fought between Ecgberht of Wessex and Beornwulf of Mercia in September 825. Sir Frank Stenton described it as "one of the most decisive battles of English history". It effectively ended Mercian S ...

(near present-day

Swindon Swindon () is a town and unitary authority with Borough status in the United Kingdom, borough status in Wiltshire, England. As of the 2021 Census, the population of Swindon was 201,669, making it the largest town in the county. The Swindon un ...

). Nicholas Brooks noted that "the Mercians stand out as by far the most successful of the various early Anglo-Saxon peoples until the later ninth century" and with the exception of three years under Northumbrian domination, this is true between the years 633 and 825.{{Cite encyclopedia , last=Brooks , first=N. , author-link=Nicholas Brooks (historian) , title=The formation of the Mercian kingdom , editor=Steven Bassett , encyclopedia=The Origins of Anglo-Saxon Kingdoms , location=Leicester , year=1989 p. 159 Recorded by

Bede Bede ( ; ang, Bǣda , ; 672/326 May 735), also known as Saint Bede, The Venerable Bede, and Bede the Venerable ( la, Beda Venerabilis), was an English monk at the monastery of St Peter and its companion monastery of St Paul in the Kingdom o ...

as the nemesis of early Anglo-Saxon

Northumbria la, Regnum Northanhymbrorum , conventional_long_name = Kingdom of Northumbria , common_name = Northumbria , status = State , status_text = Unified Anglian kingdom (before 876)North: Anglian kingdom (af ...

, Penda of Mercia achieved an early expansion of his kingdom's territory, but his reign ended with his death in battle, which was followed by a brief three-year period when Northumbria ruled over the Mercians. The rebellion against Northumbria by Penda's son Wulfhere in 658 immediately preceded the restoration of Penda's kingdom and a period of expansion in which Mercia's influence reached as far south as the

Isle of Wight The Isle of Wight ( ) is a county in the English Channel, off the coast of Hampshire, from which it is separated by the Solent. It is the largest and second-most populous island of England. Referred to as 'The Island' by residents, the Isle of ...

. During this period of expansion, Mercia lost its province of the

Kingdom of Lindsey The Kingdom of Lindsey or Linnuis ( ang, Lindesege) was a lesser Anglo-Saxon kingdom, which was absorbed into Northumbria in the 7th century. The name Lindsey derives from the Old English toponym , meaning "Isle of Lind". was the Roman name of th ...

to Northumbria in 661, but its recapture by

Æthelred of Mercia Æthelred (; died after 704) was king of Mercia from 675 until 704. He was the son of Penda of Mercia and came to the throne in 675, when his brother, Wulfhere of Mercia, died from an illness. Within a year of his accession he invaded Kent, wh ...

following the

Battle of the Trent The Battle of the Trent was a battle fought at an unspecified site near the River Trent within the Kingdom of Lindsey (today part of England), in 679. The battle was fought between the Northumbrian army of King Ecgfrith and the Mercian army of Kin ...

in 679 secured Mercia's position as the dominant Anglo-Saxon power for over a century. Mercia's hold over the Anglo-Saxon kingdoms of

Essex Essex () is a county in the East of England. One of the home counties, it borders Suffolk and Cambridgeshire to the north, the North Sea to the east, Hertfordshire to the west, Kent across the estuary of the River Thames to the south, and G ...

Sussex Sussex (), from the Old English (), is a historic county in South East England that was formerly an independent medieval Anglo-Saxon kingdom. It is bounded to the west by Hampshire, north by Surrey, northeast by Kent, south by the English ...

and

Kent Kent is a county in South East England and one of the home counties. It borders Greater London to the north-west, Surrey to the west and East Sussex to the south-west, and Essex to the north across the estuary of the River Thames; it faces ...

seems to have been tenuous until 716, when

Æthelbald of Mercia Æthelbald (also spelled Ethelbald or Aethelbald; died 757) was the King of Mercia, in what is now the English Midlands from 716 until he was killed in 757. Æthelbald was the son of Alweo and thus a grandson of King Eowa. Æthelbald came to t ...

restored Mercia's hegemony for over forty years. Offa's accession in 757 heralded the beginning of a golden age for Mercia. Some historians have suggested that Offa's defeat of the

Welsh Welsh may refer to: Related to Wales * Welsh, referring or related to Wales * Welsh language, a Brittonic Celtic language spoken in Wales * Welsh people People * Welsh (surname) * Sometimes used as a synonym for the ancient Britons (Celtic peop ...

and the West Saxons of Wessex established the Mercian Supremacy, which remained unchallenged until 825 when

Egbert of Wessex Ecgberht (770/775 – 839), also spelled Egbert, Ecgbert, Ecgbriht, Ecgbeorht, and Ecbert, was King of Wessex from 802 until his death in 839. His father was King Ealhmund of Kent. In the 780s, Ecgberht was forced into exile to Charlema ...

supported an East Anglian rebellion against

Beornwulf of Mercia Beornwulf (died 826) was King of Mercia (roughly the Midlands of England) from 823 to 826. His short reign saw the collapse of Mercia's supremacy over the other kingdoms of the Anglo-Saxon Heptarchy. Biography A man named Beornwulf is mentio ...

, whose defeat at Ellendun effectively brought the Supremacy to an end.

References

Supremacy