Since the conquest of the Iberian Peninsula, William's interest has shifted from fighting with the Christian states to the conquest of pagans.

Unlike when the Christian countries were at war, there were no need to consider so many political, diplomatic and religious factors to carry out the war with the pagan countries, and it won the general support of many Christian countries, because William, a war maniac, could finally point the spear originally aimed at the pagans, and they could finally live a peaceful life.

But even if, as the European monarchs had expected, the Norman Empire, led by William, soon after launched another war of conquest against the Murabit dynasty in North Africa, the European world did not get the peace they wanted.

At the same time, with the exception of the Norman Empire, the Cluny movement was still re-emerging like wildfire, and the churches became more and more independent with the support of the Clunies, and were no longer willing to submit to the arrangements of the feudal monarchs.

In 1070, Henry IV became more prominent, first divorcing Bertha of Savoy and then replacing Anno with his close relationship with Adelbert, Archbishop of Bremen, thus taking control of the military and political power of the Holy Roman Empire.

In 1073, the powerful Holy Roman Emperor Henry IV, in order to consolidate his power in Saxony, built castles throughout Saxony and sent royal guards to station, which undoubtedly aroused the dissatisfaction of the local nobles and princes, so much so that a large-scale Saxon rebellion broke out.

The rebellion lasted for three years, during which several princes were involved, and as many as 60,000 troops were involved, and both sides were exhausted.

By June 1075, Henry IV had defeated the Saxon revolt on the battlefield and captured Lüneburg.

Henry IV seemed to have won the final victory, and he was about to gain the entire vast Duchy of Saxony, but unexpectedly, while personally leading his troops to quell a domestic rebellion, he was shot through the lobe of the lung by an undirected crossbow arrow, and died soon after coughing up blood.

Before his death, Henry IV left a will, asking to pass his throne and the territory of Franconia to his brother-in-law, the former Hungarian king Solomon, but the German princes did not agree to Henry IV's deathbed arrangements, so that the position was vacant, and the German princes completely lost their leader.

In a few years, without the suppression of the emperor, the German princes became more and more independent, and even began to openly declare themselves as independent kings, and the Saxons, who had been frantically suppressed by Henry IV, were even more revived, including Welf of Bavaria, Rudolf of Swabia, Dirk of the Netherlands and other monarchs even began to claim themselves as kings of their respective countries.

Suddenly, kingdoms such as the Kingdom of Holland, the Kingdom of Germany, the Kingdom of Germania, the Kingdom of Saxony, the Kingdom of Bavaria, and the Kingdom of Bohemia appeared within the Holy Roman Empire, just like the Seven Heroes of the Warring States Period in the East.

Everyone was waging war against each other for their own hegemony, but Henry IV's will was ignored, and Solomon had to retreat to Hungary before he entered Germany, and Franknia of the Salian family was subsequently divided among the princes, and a once powerful dynasty died silently.

Of course, William's impetus is indispensable, otherwise the Holy Roman Empire will not be completely out of control as it is now, but will re-elect a nobleman who can serve the people as the new emperor through elections as in the past.

Over time, the turmoil of the Holy Roman Empire gradually swept the surrounding countries into it, starting with King Bolesław II of Poland, who saw the turmoil in the empire and saw that there was an opportunity to take advantage of it, and led 16,000 troops to wage war against the Kingdom of Bohemia.

Then the Kingdom of Hungary was not willing to be lonely, Solomon's brother, King Geza of Hungary, on the grounds of Henry IV's will, declared that he had the right to obtain the throne of the Holy Roman Empire and the territories of Franconia and Saxony, and then united with his in-law King Croatia to launch a war of succession against the princes of the Holy Roman Empire.

In addition, there are also Venice and Tuscany that have also begun to take advantage of the fire and loot on the borders of the HRE Empire.

At a time when almost everyone thought that Wilhelm would take this opportunity to send troops to attack the German princes, he made a surprising move, having already occupied Morocco and Marrakech, he once again attacked the remnants of the Murabit dynasty, and this time even invested 80,000 troops, so it can be said that most of the imperial forces were invested.

Since Wilhelm chose to turn a blind eye to the upheaval, the Germans had no scruples, and the war spread to the entire German states, fighting against the Poles, against the Hungarians and the Croats, against the Bohemians and other princes, and not for a single day of peace.

As a result of the war, trade and production were greatly disrupted, and the economy of the HRE Empire regressed to the castle age, with the population and villages confined to the vicinity of small castles, while the more remote areas were infested with thieves, princes' armies and mercenaries looting, and there was no guarantee of safety.

All of the people of Germany were longing for the stability and strength of the former Salian rule, and they were growing more and more disgusted with the chaos of the present world, and they longed for a truly powerful monarch who could put an end to the chaos that had affected the empire.

In 1080, a meeting of counts, bishops, and mayors of the Holy Roman Empire met in Frankfurt to elect the absent Norman Emperor Wilhelm as the new German king, and sent an envoy to Paris to ask Wilhelm to send troops to the Holy Roman Empire.

With this document sent by the envoy of the Frankfurt Conference, Wilhelm had the right to seize the Holy Roman Empire, and his heart to conquer Germany began to stir.

Although he very much wanted to go on the expedition, he was already a 54-year-old man at this time, and neither his wife Matilda nor the nobles in the country wanted him to lead the army in person.

In desperation, William sent his eldest son Richard, his second son Friedrich, and his third son Robert to lead tens of thousands of troops to launch a full-scale attack on the Holy Roman Empire from Lombardy, Lorraine, and Saxony.

William's three sons, all now adults, have taken over enormous power from their fathers, with the eldest son Richard being awarded the crown of King of Italy, the second son Friedrich being given the title of Kingdom of Aragon, and three Robert being appointed King of Scotland.

All three of them can't wait to lead their troops to attack the HRE Empire, trying to grab more capital in this war in order to achieve the final victory in the future game for power.