Konstantin Mihailović, also known as Constantine of Ostravica, born in 1430, was a Serbian soldier and author of a memoir of his time as a Jannissary in the army of the Ottoman Empire. Mihailović was born in the village of Ostrovica, near Rudnik in the Serbian Despotate. His book, Memoirs of a Janissary (Serbian: Успомене јаничара) was written at the end of 15th century, probably between 1490 and 1501, and provides a unique insight into life in the Ottoman Army of the time. Mihailović's stated motivation in writing the book was to provide a detailed account of the Ottoman state and its military structure in order to assist the Christian powers in their struggle against the Ottomans.
His memoirs give no insight into his early life. Instead, they begin in 1455, when an army under the command of Sultan Mehmed II laid siege to the castle of Novo Brdo for forty days. The Ottoman Army had marched from Edirne via Sofia in a campaign to establish certain control over the area that is now Kosovo. At the time, Novo Brdo was a rich mining city for silver. The garrison surrendered on June 1, 1455. According to Mihailović, the Sultan stood at the small gate of the castle and sorted the boys from the girls. He then sorted the women on one side of a ditch, and the men on the other. He then ordered all men of any distinguished rank or importance decapitated. The young women and girls, some 700 of them, were taken and married off to soldiers and Ottoman commanders. [1]