William already had a plan in his mind, and regarded Winchester, the capital of Wessex, as his ruling center in the Kingdom of England, with Winchester as the core and radiating many territories in the south of England to which he belonged.

For the time being, William had two cities in his possession suitable as centres of rule, one was Winchester, where he was located, and the other was the city of London, which he occupied.

Located on the plains of the southeast of England, across the River Thames, London is ideally located and steeped in history, dating back more than a thousand years.

The history of the City of London can be traced back to the first century AD, when the Romans formally conquered what would become Britain in 43 AD under the leadership of Emperor Claudius. They built a settlement on the banks of the River Thames and named it "Londinium". Later, the Romans built walls here and gradually built a large-scale city in the area surrounded by the walls.

Although Londinium may seem like a Latin name, some scholars believe that the word derives from the language of the Celts who originally lived in the area, and may have meant a wilderness place, or a place where a river flowed.

The book of Romans refers to London from 50 AD, and the name London comes from the Celtic word for Londinium. After the Celts invaded Britain in 43 AD, they built a bridge across the River Thames, after which they found it advantageous and built a port. Around 50 AD, Roman merchants built another town by the bridge, and London was born.

In 61 AD, Queen Boudicca led a popular revolt against Roman rule, and her army marched to London. London was destroyed in the war, and after the war it was rebuilt by Queen Boudicca. The rich people in the city built their houses out of stone and brick, while most of the poor lived in wooden houses.

In the latter part of the 2nd century, the 6-metre-high stone walls were built around London, and the population of London had grown to the largest town in England at the time.

In 407 AD, with the last Roman troops leaving England, the town of London began to decline, with a large number of inhabitants leaving the city and only a few fishermen and farmers living within the city walls. London also lost its function as a city. But soon London was re-developed, and a new city appeared in the city wall surgery of Ventgordon, London. The new town is small and has a population of only about 10,000 people.

In 842 and 851, the Danes invaded England twice, looting and burning most of the towns. The invading army occupied the northern and eastern territories of Great Britain, including London.

In 878, the Danes were defeated by Alfred the Great, and the British lands were divided into two parts, with the Danes taking the eastern territories of England, including London. Alfred the Great, on the other hand, kept the lands in the southern and western regions.

Through peace negotiations, Alfred the Great regained London in 886, and he rebuilt the walls of the dilapidated old city of Rome. In order to be protected, Londoners living outside the city of Rome moved back to the city during the reign of Alfred the Great.

In 994, the Londoners repelled the Danes and forced them to evacuate.

By the 11th century, it had become the capital of England, and the struggle between the Edward and Godwin families of the Confessors, the struggle for the throne between William and Harold Godwinson in the Norman conquest, and the Hundred Years' War for later generations all revolved around the city of London.

Although there are many advantages and conveniences to make the city of London the capital and ruling center of William in England, there are also many troubles in making it the capital in London.

In London, there were not only hostile Anglo-Saxon nobles and burghers, but also evil speculators, conspirators, and assassins, the aristocratic princes of England, and the unrelenting King of England, Edward the Confessor.

Now the real reassurance of William and the Normans in the city of London is the Tower of London Castle and the nearby Norman-controlled city, and it is only in this place guarded by the castle that he and the Normans can feel the long-lost sense of security.

It can be said that the city of London is now an extremely dangerous powder magazine, which can be ignited with only a single spark, with devastating consequences, and if it is close, William is likely to be crushed.

William's approach to the city of London was to isolate, artificially separating the Normans from the English by building walls and castles so that they could have a safe environment.

William could not have disposed of all the hostile English in a terrible purge, and if he did, it would undoubtedly anger the English, not help William gain a foothold in the Kingdom of England, and give the Anglo-Saxon nobility hostile to him an excuse to tear up the peace treaty that had just been signed.

This was something William did not want to see, because for he to gain a foothold in England, he needed enough time to accept the territory, reorganize his army and defenses, and consolidate his territory in the south of England.

William preferred Winchester to the turbulent city of London, a historic city that was also the ancient capital of Wessex and the Kingdom of England.

William chose Winchester as his capital and ruling center in England and Britain, in addition to considering the historical heritage and political status of Winchester that is not inferior to the city of London, its geographical location is also the main reason why William chose it.

Winchester is located on the edge of the Hampshire and South Dons Hills in the southeast of England, and was later the county seat of Hampshire.

The city is less than 20 kilometres from Southampton, the most important port city in Wessexshire, and is easily accessible from Southampton's harbour and Le Havre in Rouen, Normandy, across the English Channel.

The choice of Winchester, Wessex, as the centre of William's rule in England, was a convenient link between Normandy and the southern territories of England, linking the two into a cohesive whole.

In addition to its easy access to Normandy, Winchester was also the center of the entire southern territory of England, not far from Oxford, Kent, Wiltmin, and other southern counties of England, and Winchester also had several Roman roads that have survived to this day, using these transportation arteries, William could easily communicate with the counties, extend his power in all directions, and firmly hold the Duchy of Wessex in his hands.

When the city of Winchester in Wessex was selected as the capital of the Northern England Territory, William had already considered in detail, and in the future, the Duchy of Wessex and other southern territories of England centered on Winchester would be the base of William's conquest of England, while Rouen, which was only separated by a channel, was William's other capital, and the capital city was established to protect the Norman Cavalry Kingdom and seize France.

In William's vision, his territory would include both sides of the English Channel, including the northwestern region of France with Rouen as its capital and the southern territory of England centered on Winchester, which were the two eagle heads of the Norman double-headed eagle, and their eyes were always on France and England.