The causes and motives that led to the deposition of Henry IV by his son remain debated among modern researchers.
Stefan Weinfurter argues that religious reform motives and the corrosive influence of a group of young Bavarian counts - Margrave Diepold III von Vohburg, Count Berengar II of Sulzbach and Count Otto von Habsburg-Kastl - are the primary causes.
These nobles succeeded in convincing the young Henry V of his father's lost cause and the eventual triumph of reform.
If he did not act and waited until his father died, someone else would attempt to ascend the throne and would find many supporters.
Out of concern for his salvation, Henry then abandoned his father and joined the "salvation community" of the young Bavarians.

Another line of research supports the theory that the murder of Sieghard of Burghausen in February 1104 by ministerials and citizens of Regensburg was the trigger for the overthrow of Henry IV.
According to Burghausen's relatives and other nobles, the emperor had failed to punish the perpetrators appropriately, proving that Henry IV viewed aristocrats with disdain.
Henry V had attempted in vain to mediate an amicable settlement between Burghausen and the ministerials in the dispute that led to the murder, and he also would have had a reason to resent his father's inaction.
A flaw in this theory is that there was a very long time lag between the murder of Burghausen and when Henry V turned his back on his father.

In November 1104, Henry V had joined his father's army on a punitive expedition against Saxon Reformers who had opposed the election of the Archbishop of Magdeburg.
On December 12, 1104, Henry V broke away from his father, thereby breaking the oath of allegiance to the ruling king.
Henry V made his way to Regensburg, where he celebrated Christmas with his followers.
While there, his father's enemies sought to convince him to revolt.
Henry considered their arguments, but he was restrained by the oath he had taken to take no part in the business of the Empire during his father's lifetime.
At the turn of the year 1104/05, he sent messengers to Rome to seek absolution from his loyalty oath by Pope Paschal II, The Pope promised Henry V, on condition that Henry be a righteous king and a promoter of the Church, not only absolution from the sin of breaking this oath, but also support in the struggle against his father.

Between 1105 and 1106, supporters of Henry IV and Henry V each disseminated arguments in letters and historiographic texts in order to build support among the people of the empire, while father and son each accused the other of disregard for the divine and earthly orders.
Henry V began to strengthen his ties with Saxony, where the opposition against his father was particularly strong due in part to his absence from the duchy since 1089.
In the spring of 1105, Henry V stayed in Saxony for two months and showed his willingness to work with the church on the basis of Gregorian ideas by removing the bishops, Friedrich von Halberstadt, Udo von Hildesheim, and Henry von Paderborn, who had been appointed by his father.
In Quedlinburg, he entered the town barefoot on Palm Sunday, thus demonstrating his humility (humilitas), an elementary Christian virtue of rulers.
His stay concluded with the celebration of the Pentecost festival in Merseburg and the confirmation of the Magdeburg metropolitan.

Henry V promised the hand of his sister, Agnes, in marriage to the Babenberger, Leopold III, thereby convincing Leopold to abandon his father's party.
By the end of October 1105, Henry V arrived at Speyer, the centre of Salian rule.
There, he installed Gebhard, a fervent opponent of his father, as Bishop.
In the fall of 1105, the armies of father and son faced each other at the Regen river.
However, a battle was prevented by the princes of both sides who wished to find a peaceful solution.
At Christmas 1105, an agreement was to be reached at a diet in Mainz.

Henry IV advanced to Mainz for the announced diet.
According to the Vita Heinrici IV On December 20, 1105 in Koblenz Henry V "fell around his fathe
The causes and motives that led to the deposition of Henry IV by his son remain debated among modern researchers. Stefan Weinfurter argues that religious reform motives and the corrosive influence of a group of young Bavarian counts - Margrave Diepold III von Vohburg, Count Berengar II of Sulzbach and Count Otto von Habsburg-Kastl - are the primary causes. These nobles succeeded in convincing the young Henry V of his father's lost cause and the eventual triumph of reform. If he did not act and waited until his father died, someone else would attempt to ascend the throne and would find many supporters. Out of concern for his salvation, Henry then abandoned his father and joined the "salvation community" of the young Bavarians.
Another line of research supports the theory that the murder of Sieghard of Burghausen in February 1104 by ministerials and citizens of Regensburg was the trigger for the overthrow of Henry IV. According to Burghausen's relatives and other nobles, the emperor had failed to punish the perpetrators appropriately, proving that Henry IV viewed aristocrats with disdain. Henry V had attempted in vain to mediate an amicable settlement between Burghausen and the ministerials in the dispute that led to the murder, and he also would have had a reason to resent his father's inaction. A flaw in this theory is that there was a very long time lag between the murder of Burghausen and when Henry V turned his back on his father.
In November 1104, Henry V had joined his father's army on a punitive expedition against Saxon Reformers who had opposed the election of the Archbishop of Magdeburg. On December 12, 1104, Henry V broke away from his father, thereby breaking the oath of allegiance to the ruling king. Henry V made his way to Regensburg, where he celebrated Christmas with his followers. While there, his father's enemies sought to convince him to revolt. Henry considered their arguments, but he was restrained by the oath he had taken to take no part in the business of the Empire during his father's lifetime. At the turn of the year 1104/05, he sent messengers to Rome to seek absolution from his loyalty oath by Pope Paschal II, The Pope promised Henry V, on condition that Henry be a righteous king and a promoter of the Church, not only absolution from the sin of breaking this oath, but also support in the struggle against his father.
Between 1105 and 1106, supporters of Henry IV and Henry V each disseminated arguments in letters and historiographic texts in order to build support among the people of the empire, while father and son each accused the other of disregard for the divine and earthly orders. Henry V began to strengthen his ties with Saxony, where the opposition against his father was particularly strong due in part to his absence from the duchy since 1089. In the spring of 1105, Henry V stayed in Saxony for two months and showed his willingness to work with the church on the basis of Gregorian ideas by removing the bishops, Friedrich von Halberstadt, Udo von Hildesheim, and Henry von Paderborn, who had been appointed by his father. In Quedlinburg, he entered the town barefoot on Palm Sunday, thus demonstrating his humility (humilitas), an elementary Christian virtue of rulers. His stay concluded with the celebration of the Pentecost festival in Merseburg and the confirmation of the Magdeburg metropolitan.
Henry V promised the hand of his sister, Agnes, in marriage to the Babenberger, Leopold III, thereby convincing Leopold to abandon his father's party. By the end of October 1105, Henry V arrived at Speyer, the centre of Salian rule. There, he installed Gebhard, a fervent opponent of his father, as Bishop. In the fall of 1105, the armies of father and son faced each other at the Regen river. However, a battle was prevented by the princes of both sides who wished to find a peaceful solution. At Christmas 1105, an agreement was to be reached at a diet in Mainz.
Henry IV advanced to Mainz for the announced diet. According to the Vita Heinrici IV On December 20, 1105 in Koblenz Henry V "fell around his fathe
Henry V, Holy Roman Emperor