Hertford received borough status from King Edward the Elder between 913–924 AD.
The town's strategic location on the River Lea made it a key defensive point against Danish (Viking) settlers in Danish Mercia (from ~870 AD). Hertford's garrison helped defend Wessex.
The Anglo-Saxon Chronicle notes Hertford sending ships up the River Lea to aid King Alfred when Mercians invaded Wessex around the same period.
Borough status granted Hertford market rights, self-governance (a reeve/portreeve), and defensive obligations (burh). It became a fortified administrative center in the network of burhs securing southern England.