Upon the death of his brother Alaeddin Ali Celebi, he became the sole heir to the Ottoman throne.
He ascended to the throne at the age of 12, only to hand it over back to his father due to his young age.
At the age of 19, he ascended to the throne after the death of his father.
He took control of the situation in Anatolia and the Balkans and focused on the conquest of Istanbul.
In 1453, he besieged Istanbul, which was ruled by the Byzantine Empire, for 54 days.
He changed the course of the war by moving the ships from the land to the Golden Horn.