Sinan-i Atik, also known as Azadlı Sinan, and Atik Sinan (meaning Sinan the Freedman; azadlı shows that atik does not mean old, and is not used to distinguish him from Koca Mimar Sinan Agha), was an Ottoman architect for Sultan Mehmed II from the empire's Greek community during the 15th century.
He is credited with being the architect who designed and built Istanbul's first selatin mosque, the Fatih Mosque and its complex, in 1471 for Mehmed II, over the ruins of the Church of the Holy Apostles, which was razed to the ground by the Ottomans in order for the Fatih Mosque to be built. His nephew, also an architect, built Bayezid II Mosque. Tradition holds that Sultan Mehmed II endowed the Greek orthodox Church of St. Mary of the Mongols, the only church in Istanbul still standing never converted into a mosque, to the mother of Christodoulos (Sinan's Greek name) in acknowledgment of his work. This grant was confirmed by Bayazid II, in recognition of the services of the nephew of Christodoulos, who built the mosque bearing that sultan's name.
Legend has it that because the architect failed to make the dome of the mosque bigger and higher than Hagia Sofia, the disappointed and angered Mehmed II amputated the hand of the architect. Sinan complained to the city judge (kadhi), who ruled what the sultan did was unjust and judged that the architect could amputate the sultan's hand in return. Seeing the sultan submit to the judge's order, the Greek architect was amazed with Muslim justice, pardoned the sultan, and converted to Islam. The sultan rewarded Sinan by giving him the ownership of a whole street, a gift recognized by Ahmed III three centuries later.