However, the Seljuks did not kill Romanus IV, nor did they continue north to attack the Eastern Roman Empire. Instead, they released him and continued westward towards the Fatimid Caliphate.

According to Alp Arslan, the Sultan of the Seljuk Empire at the time, the nephew of the current Khan Tughril and the son of Deputy Khan Chagar.

The Seljuks had only one goal, which was to unify the Islamic world and eliminate Shiite heresy.

The reason for this is that as foreign Turks, the Seljuks had to first submit to Islam and become staunch supporters of Islam if they wanted to rule the Arab world.

It also happened that there were many factions within Islam, with the two main factions being Sunni and Shia.

The Abbasid dynasty was originally a Shiite dynasty, but later converted to Sunni Islam. The Sunni population was large, and believers were spread throughout Khorasan and Persia. If the Seljuks wanted to gain a foothold in the Middle East, they naturally had to play the Caliph card well.

This is like Cao Cao using the emperor to control the princes.

Although the Caliph no longer had much real power, his religious status was still there, so the Seljuks had to take root in the Sunni sect and attack their Shiite rivals.

The current Shiite states are the Buyid Dynasty and the Fatimid Dynasty, so the main attack direction of the Seljuks is to the west, and the Buyid Dynasty has become their primary target.

Historically, after they conquered Iran and Afghanistan, they did not continue to attack the Buyid Dynasty, but actively contacted the Abbasid Caliph Qaim.

Three years later, in 1055 AD, Qa'im finally summoned them.

So the two brothers gathered a large army and marched westward, destroying the Buyid Dynasty almost unhindered, and were appointed Seljuk Sultan by Kaim.

At present, the emergence of the Song Dynasty has seriously changed the course of history.

The Tugrile brothers believed that the envoys of the Song Dynasty had contacted the Delam people and were likely to sell firearms such as guns and rifles to them.

Once the Buyid Dynasty had these weapons, they would lose any advantage and might even be destroyed by the other side.

Therefore, they had to strike first and destroy the Buyid Dynasty before the two sides traded firearms.

The situation in the Middle East is once again in turmoil.