Shrewsbury, United Kingdom

It is claimed that Pengwern, sometime capital of the Kingdom of Powys (itself established by the 440s), was at Shrewsbury, and it has been said in Parliament that the town was founded by the late 600s, the basis for this likely the Anglo-Saxon Chronicle's account of the 584 battle at Fethanleag, where Ceawlin defeated the Britons and captured numerous settlements including possibly Uriconium, which sets the historical context for the first likely textual mention of Shrewsbury in the poetry of the British prince Llywarch Hen, who mourned the destruction of Uriconium. Llywarch Hen's presence at the court of Prince Cynddylan at Pengwern, understood as the British name for Shrewsbury, implies the town's existence during this period. There is consistent tradition that the town was "founded in the 5th century, on occasion of the decay of the Roman Uriconium." Historian John Wacher suggests that Shrewsbury may have been refortified by refugees fleeing an outbreak of a plague in Viroconium around this time. Context for the nature of early Medieval period life in the wider district can be found in archaeological evidence on the nearby Attingham estate, where foundations of two rare 25m-long Anglo-Saxon timber halls dating to around 650 AD have been discovered, highlighting a significant and well-resourced Anglo-Saxon community in the region.

The first attested association of Pengwern with Shrewsbury is mentioned by Giraldus Cambrensis in the 12th century. Alternative suggestions as to the location of Pengwern include Whittington Castle near Oswestry, and Berth, a hillfort near Baschurch. The Historia Divae Monacellae, composed in the 14th or 15th century, says that Brochwel Ysgithrog, the 6th-century king of Powis, had a palace at Shrewsbury that became the site of the foundation of St Chad.

In the late 8th century, it is said that Offa took the town for the Mercians in 778, and he is associated by some sources with establishing the town's first church and dedicating it to St Chad. If so, then there may have been an ecclesiastical foundation in the town within a century of the death of Chad of Mercia.

Shrewsbury remained part of the Mercian kingdom until its incorporation into the larger realm of England under Egbert in the first half of the ninth century. During the subsequent Saxon period, historical records of the town are scarce.

Early in the tenth century Athelstan made a law to secure uniformity of coinage throughout his dominion, and this enactment specified the number of moneyers in the principal towns. Shrewsbury possessed one such moneyer, proving that while it reached a certain point of importance it did not rank among towns of the first class (this number was later raised to three in the reign of Edward the Confessor; and all through the period from Athelstan to Henry III, the Shrewsbury mint was busy).

Viking raiders from the north were reaching as far south as Bridgnorth by 910, and in 914, Æthelflæd, daughter of Alfred the Great and known as the Lady of the Mercians, fortified Shrewsbury, along with Hereford and two other fortresses, at Scergeat (a currently unknown location) and Weardbyrig (thought to be Whitchurch, which would make sense given the strategic importance of the Roman Road link via the Via Devana). Recent excavations at Shrewsbury Castle, funded by the Castle Studies Trust, revealed a massive defensive ditch surrounding the Norman motte and evidence of fortified presence on the castle site, predating the Norman invasion.

Some time before 918, the relics of St Alkmund were translated to Shrewsbury and back to Shropshire from Derby, this was probably the work of Æthelflæd. This return to Shropshire move followed Alkmund's initial burial in Shropshire after his death in 800.

Later, King Edgar (957–75) established a collegiate church with a dean and 10 prebendaries at St Alkmund's Church, it was a Royal peculiar, and subsequently, it became the property of Lilleshall Abbey in about 1145, when the relics were retranslated back to Derby.

Following Æthelflæd's fortification of Shrewsbury, the town largely avoided the devastating wave of the Danish invasions that impacted other parts of England. This immunity, which extended across Shropshire, is notable despite evidence of Danish ships on the River Severn (suggested by the name Danesford near Bridgnorth) and a recorded Danish defeat at Buttington (near Welshpool) in 894. The protection of the region is mainly attributed to Æthelred, the ealdorman of Mercia appointed by Alfred, and Æthelflæd herself. Subsequently, during the tenth century, Shrewsbury appears to have experienced a period of relative stability. An historical narrative, well established in the nineteenth century, asserts that during the devastating Danish invasion of 1006, Æthelred the Unready withdrew to his royal seat in Shrewsbury. In this account, the King experienced "great perplexity," reflecting the collapse of the national defense. This strategic withdrawal preceded the disastrous decision to pay the immense sum of £30,000 Danegeld in 1007 to halt the Danish advance.