The Battle of Cirencester was fought at Cirencester

Cirencester

Cirencester is a market town in east Gloucestershire, England, 93 miles west northwest of London. Cirencester lies on the River Churn, a tributary of the River Thames, and is the largest town in the Cotswold District. It is the home of the Royal Agricultural College, the oldest agricultural...

, Britain in 628. The conflict involved the armies of Mercia

Mercia

Mercia was one of the kingdoms of the Anglo-Saxon Heptarchy. It was centred on the valley of the River Trent and its tributaries in the region now known as the English Midlands...

, under King Penda, and the Saxons

Saxons

The Saxons were a confederation of Germanic tribes originating on the North German plain. The Saxons earliest known area of settlement is Northern Albingia, an area approximately that of modern Holstein...

 of Wessex

Wessex

The Kingdom of Wessex or Kingdom of the West Saxons was an Anglo-Saxon kingdom of the West Saxons, in South West England, from the 6th century, until the emergence of a united English state in the 10th century, under the Wessex dynasty. It was to be an earldom after Canute the Great's conquest...

, under Kings Cynegils and Cwichelm

Cwichelm

Cwichelm may refer to:*Cwichelm of Wessex, Prince of Wessex*Cwichhelm , Bishop of Rochester...

. The Mercians defeated the Saxon army and, according to Bede

Bede

Bede , also referred to as Saint Bede or the Venerable Bede , was a monk at the Northumbrian monastery of Saint Peter at Monkwearmouth, today part of Sunderland, England, and of its companion monastery, Saint Paul's, in modern Jarrow , both in the Kingdom of Northumbria...

, "after reaching an agreement", took control of the Severn valley

Severn Valley (England)

The Severn Valley is a rural area of mid-western England, through which the River Severn runs and the Severn Valley Railway steam heritage line operates, starting at its northernmost point in Bridgnorth, Shropshire and running south for 16 miles to Bewdley, Worcestershire in the Wyre...

 and the minor kingdom of the Hwicce

Hwicce

The Hwicce were one of the peoples of Anglo-Saxon England. The exact boundaries of their kingdom are uncertain, though it is likely that they coincided with those of the old Diocese of Worcester, founded in 679–80, the early bishops of which bore the title Episcopus Hwicciorum...

, which had been under the influence of Wessex since the Battle of Dyrham in 577.