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There were plenty of Ottoman princes who had no love for Mehmed I. One of Bayezid’s younger sons, Yusuf, had escaped the civil war among his brothers by taking refuge in Constantinople. He was followed a few years later by a grandson of Suleyman, named Orhan. Regrettably, it soon emerged that neither Yusuf nor Orhan were of much use as potential challengers to Mehmed. Orhan was probably a child when he arrived in Constantinople. He could only be kept in reserve for some possible use in the future and he was destined to play a minor role in the last siege of Constantinople in 1453. Mehmed’s brother Yusuf turned out to be a man of letters rather than of action. He became fascinated by ancient Greek literature and accompanied Manuel’s eldest son John to school to study the classics. So impressed was Yusuf with what he saw in Constantinople that he begged the emperor to allow him to be accepted into the Orthodox Church. Manuel was reluctant to permit this, no doubt because a Christian Yusuf would have little chance of ever becoming sultan and therefore his political usefulness would be at an end. Then in around 1416 plague broke out in Constantinople and Yusuf was struck down by the disease. On his deathbed he begged to be baptised and his request was honoured, the Christian name of Demetrius being given to him. The next day he died, and Manuel saw to it that he was buried with all the honour due to a Christian prince in the monastery of St John Stoudios”Jonathan Hariis, The End of Byzantium, Yale University Press, 2011, s. 86-87
