I see you have displayed music from Crusader Kings II. Note that much of my application takes inspiration from Crusader Kings II, though it is also the result of some research.

Name of Country: The Cuman-Kipchak Confederation, or "Cumania"

Religion: Tengriism

Leader: Khan Saru

Flag: [img=http://upload.wikimedia.org/wikipedia/commons/1/16/CumaniaCoA.png]

Is it apart of the Crusades: No

History: The Cuman-Kipchak Confederation was the dominant political entity in the westernmost portion of the Eurasian Steppe. As its name implies, it was a confederation of tribes, over which two Turkic nomadic tribes were dominant: the Kipchak, who lived in the eastern half, and the Cumans, who lived in the western. The name "Cumania" is in fact just an exonym given to it by the Christian kingdoms it bordered to the west, who only ever saw Cumans; Islamic sources instead give it the name "Desht-i Qipchaq", or "Steppe of the Kipchaks".

The confederation of tribes had never politically unified into a single strong nation state. The tribes met as a council and answered to each other, and would aid each other at times, defending the whole confederation from outside forces, but they had usually just administered their own areas, sticking to their own politics. The great Khan Saru, khan of the Cumans and current head of the confederation, urgently sought to change this. He saw the kings to the west and the sultans to the south. He had witnessed firsthand their infrastructure and their castles. Though his advisers scoff at the notion of giving up the nomadic ways and instituting such foolhardy ideas as fiefdoms and titles, he had seen the power of the Byzantine Empire. And he believed the first step was to unite all of the believers in the true Gods, Tengri the Sky-Father and Eje the Earth-Mother, under one organized religion.

The Tengri faith was under attack, Saru believed. Each day another one of his best men would turn to the heathen faiths in the south and the west. Mohammedans, Christians, Zoroastrians, all seeking to establish new religious institutions to further propagate their non-belief in the Sky-Father. Already some tribes to the north have converted to Islam entirely, and their prowess in fighting against the confederation has increased tremendously because of it. His shamans, having procured the various religious texts from raids of the Christians and Mohammedans, say the best way to fight back is with a text of their very own about the legends of the Sky-Father and Earth-Mother, one that every tribesman will be ordered to read and memorize. However, they say that the only way all of the tribesmen would truly be dedicated to this newly-organized faith is with a show of Saru's own dedication to the faith - he would have to take back the proper Tengri holy sites within the Kingdom of Hungary and the Emirate of Khiva. 

With Khiva neighboring the giant Seljuk-controlled lands and Hungary nestled next to the giant Holy Roman Empire, Saru was at a loss of what he could do. However, with the severe weakening of the confederation's southern neighbor by the newly-proclaimed Sultanate of Rum, and the gearing of all of Christiandom to strike back at this invader, Saru began to see an opening...

Extra: As a confederation of nomadic tribes, its borders are very ambiguous and contested, but its westernmost tribes border the Christian kingdom of Hungary, while its easternmost tribes are bordered to the south by the Emirate of Khiva. Khan Saru plans to invade the Kingdom of Hungary and the Emirate of Khiva while both the Catholics and the Sunnis are distracted by their participation in the First Crusade. He'll need the participation of the Kipchak tribe to the east, however, and that won't be an easy task.

In Crusader Kings II, to reform a pagan religion, one must either own all 5 of a pagan religion's Holy Sites, or own 3 out of 5 Holy Sites, and have 750 Piety and 50% moral authority in the religion. As you can probably guess, for Tengriism, one of those is in Hungary while the other is in Khiva. The other three, at the time of the First Crusade, are all controlled by Cumania.