Murad II was born in 806 AH about 1404 AD in Amasia. In 824 AH about 1421 AD, he was just 18 years of his age when he became 6th Sultan of the Ottoman Empire after the death of his father Sultan Mohammad I. Because of which the rebellion which was crushed by Sultan Mohammad I, started to arise again. First of all, the Emir of Constantinople, while ignoring all the favors of Sultan Mohammad I, arose a guy named Mustafa who used to say himself as the son of Sultan Bayezid I and claimed to be Sultan of the Ottoman Empire, against Sultan Murad II. He sieged the city Gallipoli. But Sultan Murad II arrested him and hanged him. Sultan Murad II decided to conquer Constantinople in order to punish the Emir of this city. He sieged the city. This time, Shah Manuel played a new trick and got the help of the Emir of Carmania in order to urge the real brother of Murad II whose name was also Mustafa. He took over Nicea (Iznik) and claimed that he is Sultan of the Ottoman Empire. Sultan Murad II had to finish the siege and moved toward Nicea. He crushed this rebellion by defeating Mustafa.
After finishing this altercation, he moved towards those states of Anatolia which became independent after Timurid invasion and were involved in conspiracies against the Empire. Sultan compelled all these states to follow him and pay an annual tax. In 827 AH, about 1424 AD, after creating peace in Anatolia, returned to Europe. During this period, King Manuel had died and his son John was his successor as the next king. Therefore, Sultan Murad II preferred to compel Constantinople to pay tax on strict conditions. In 833 AH, about 1430 AD Salonika was conquered. After that Sultan Murad II moved towards Serbia which had remained an Ally of the Ottoman Empire on the basis of an act. But its new king broke the act. That’s why in 844 AH, about 1440 AD Sultan Murad II conquered Serbia again.
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In 1440 AD, a western military commander named John Hunyadi who was famous for his extraordinary valor and bravery reached Hungary and got the command to fight against Turks. After the Ankara war, Hungary got a lot of time to regain its power. In this era, Ottomans were sieging Hermanstart in Translonia. Hunyadi moved forward to help this fortress. With his small host, he defeated the great host of Turks. 20,000 Turks were killed in this battle. When Sultan Murad II came to know about this defeat, he sent another host of 80,000 warriors. Hunyadi defeated this host too. There was a wave of hope in the territories of Europe because of the great victory of Hunyadi and the defeat of Turks. There was created a great alliance of Christians in order to wipe out Turks from Europe. It was commanded by the Pop (Evgeni’s-IV Pont Max) himself. All countries of Europe were included in this alliance. This host was also commanded by John Hunyadi, who was considered as the greatest commander of the Christians.
Sultan Murad II was present in Anatolia for dealing with the altercation of Karamanid. By availing this opportunity, the Christians host kept on conquering cities one after the other. Ottoman’s host was weakened by the defeats, therefore, Sultan Murad II preferred to reconcile. At last, there was a reconciliation for the next 10 years at Dujadian in 1444 AD. According to this, Serbia got independence and Wallachia was handed over to Hungary. When Sultan Murad II went back to Anatolia after the reconciliation with his European Enemies, after fighting for almost 22 years, he got the news of the death of his son Alaaddin. He was in much grieve because of the death of his son. He was fed up of this world.
He handed over the throne to his son Mohammad (Mehmed II), who was of just 14 years, and moved towards Magnesia so that he could worship ALLAH with complete devotion in the remaining days of his life. As there spread the news of the throne of a younger and inexperience Sultan Mohammad II, the Emir of Karamanid again started an altercation. On the other side in Europe, Kardinal Julian, Hungarian King Wladyslaw, John Hunyadi, and some helpers came out for testament of Dujadian reconcile. When Ottomans moved out of Serbia and Wallachia by following the reconciliation, Christians broke the reconciliation. Ottomans were totally unaware of all this situation because of which Christians while conquering a lot of fortresses reached Varna and took over it.