However, when the city walls were constructed it was made illegal to build outside them, inhibiting expansion of the city.
Around this time, the city was made a county corporate and became the seat of one of the most densely populated and prosperous counties of England. Hand-in-hand with the wool industry, this key religious centre experienced a Reformation significantly different to other parts of England.
From the Middle Ages until the Industrial Revolution, Norwich was the largest city in England after London, and one of the most important.
Norwich continued to be a major centre for trade, the River Wensum being a convenient export route to the River Yare and Great Yarmouth, which served as the port for Norwich.
At the site of a medieval well, the bones of 17 individuals, including 11 children, were found in 2004 by workers preparing the ground for construction of a Norwich shopping centre.
The remains were determined by forensic scientists to be most probably the remains of such murdered Jews, and a DNA expert determined that the victims were all related, so that they most probably came from one Ashkenazi Jewish family. The engine of trade was wool from Norfolk's sheepwalks.
The word Norvic appears on coins across Europe minted during this period, in the reign of King Athelstan.
The Vikings were a strong cultural influence in Norwich for 40 to 50 years at the end of the 9th century, setting up an Anglo-Scandinavian district near the north end of present day King Street.