The Ottoman sun peeked out from behind the clouds in the sky of Islam at such a calamitous time in history. Ottoman sultans spread Islam's message of peace around the world, shaking the hearts of everyone from Anatolia to the Christian empires of Europe. The few centuries of Ottoman rule were the golden age of Muslims. Power, finance, religious discipline, and effective administrative systems spread the luster of the Ottoman Empire. The name is Ertugrul Gazi, who built this great empire in the history of Islam. In the first episode of Ertugrul Gazi, we saw how Artugrul saved the Seljuk Empire from the invasion of the Mongols under the orders of his father Sulaiman Shah. In this episode, we will see how Erturgrul established the foundation of the Ottoman Empire. 

The Seljuk Sultan Alauddin Kaikobad appointed the Qai patriarch Sulaiman Shah as the head of his forces for his invaluable assistance in the war against the Mongols. Later, when Sulaiman Shah's preoccupation with the affairs of the sultanate increased, the burden of the Qai tribe mainly fell on Artugrul's shoulders. And the Karaka of the Seljuks allotted to the Qais was the frontier region of the Roman Empire. Being a border region of Rome, if the Roman Empire wanted to attack the Seljuks, it would first have to face Erturgrul's forces.

In fact, Sultan Alauddin Kayakobad very cleverly allotted this territory to the Qai. Because, at that time, the Seljuks did not have the ability to handle the two-pronged attack of the Romans and the Mongols. Therefore, the Seljuk emperor was able to give the Romans a break for the time being by allocating the lands of the Karaka region to the Qai. The Romans did not dare to return because of Ertugrul's army. 

Ertugurul, on the other hand, focused on increasing his power. In 1251 AD he conquered the city of Sebastian. After the acquisition of the territory, it was named Sagut. This city was his temporary capital. Meanwhile, the Qais sowed the seeds of an empire from a tribe, as they had a powerful army. As a reward for the Thebesian victory, the Seljuk Sultan ceded more lands to Erturgrul. Later, as the borders of Erturgrul's kingdom grew, so did his power due to various territorial invasions. However, in the meantime, father Sulaiman Shah's death came as sad news. This great leader in history died while crossing the Euphrates.

After his father's death, Ertugurul sat on the throne as the most worthy son of his father according to the law. In 1230, the responsibility of the leader of the Qai tribe fell on his shoulders. However, the heroism of Ertugurul did not stop with the death of his father. He continued to conquer one region after another. When Erturgrul's power reached its peak, all the Seljuks' headaches about the Romans went away. However, the Mongols were still the biggest worry to the Seljuk Sultan. 

Successive attacks by the Mongols kept the Seljuks busy. The Mongol army became a permanent threat to the empire. Finally, they were forced to surrender to the Mongols. However, the Sultanate was retained by the Seljuk Sultans on the condition that they pay an annual tribute to the Mongols. By then, Ertugurul had taken his abilities beyond grasp. The boundaries of his own territory were indicative of a rising sultanate. Hence, the Mongols did not make the mistake of looking at Erturgrul's kingdoms in Asia Minor.

In the meantime, when Sultan Alauddin Kaikobad died in 1236 AD, his son Giashuddin Kaikhosru sat on the throne. Ertugrul was married to Halima Khatun, daughter of Shahzada Noman of the Seljuk Empire. A son was born to Artugrul in 657 AH. His name was Usman Khan. One of the great empires in the history of the world, which is known as the Ottoman Empire was born under the hands of this Usman Khan. Ertugurul died in 1287 when Osman was thirty years old.

This great soldier of Islam laid the foundations for establishing the tribe of Qai as an empire. Artugurul was given the title of 'Gazi' after fighting numerous battles and returning alive victorious. The word is still pronounced with his name in honor. His deeds were greater than his name. A mosque in Turkmenistan is named Ertugrul Gazi Mosque in his honor. Also, when his son Osman established the Ottoman Empire, the empire's first coins bore his name and image. Recently, a Turkish TV series have been made based on the life of this brave soldier. This TV series called 'Dirilis Ertugrul' is currently the most popular TV series in Bangladesh and other Islamic countries as well.

Erturgrul capitalized on the Islamic rule in Asia Minor that later led to the founding of the Ottoman Empire. The empire that spread the message of peace of Islam to the world for the next 700 years. From Asia Minor to Europe, Africa, and even the entire Mediterranean the Ottomans had sole domination. In the history of Islam, such a strong and lasting sultanate has never been seen. Therefore, not only Anatolia, but the whole Muslim world is eternally indebted to Ertugurul. 

Rise of the Ottoman Empire: After his father's death, Seljuk Sultan Ertugrul's son Osman Khan succeeded him. Usman Khan was also a brave warrior like his father and grandfather. As a result, the Seljuk sultans became quite attracted to Osman. Due to his merits, he was appointed as the Commander-in-Chief of his army. Not only that, but the Seljuk Sultan also gave his daughter in marriage to Osman. Osman became an important figure in the Sultanate as he performed the assigned duties with great success.

Kaikhosru was killed in a battle with the Mongols in 1299-1300 AD. He had no sons but only one daughter. Osman Khan was tied to him by fate. So the high officials of the empire unanimously declared Osman Khan as the new Sultan. Thus the empire established by the descendants of Israel Ibn Seljuk in 470 Hijri (1077-78 AD) was dissolved and the Ottoman Empire was established in its place. Osman's father Artugrul Gazi sowed the seeds.