Davud Ağa (?-1598):
Davud Ağa was a pupil of Mimar Sinan. After Sinan’s death, Davud Ağa became the Chief Architect. When Sinan was the Chief Architect, Davud Ağa worked as the minister of waterways, and repaired canals and drains in Istanbul. He renovated the Topkapı Palace and its waterways. Davud Ağa participated in the Iran Campaign in 1593. After returning to Istanbul, he worked on renovations of the Holy Room (Hasoda) and hamams in the Topkapı Palace. Davud Ağa built Mehmed Ağa Mosque and Mehmed Ağa Hamam under the supervision of Mimar Sinan. To build large mosques, Davud Ağa used variations of plans of octagons and hexagons like Sinan. Davud Ağa became the Imperial Chief Architect (Hassa Mimarbaşı) in 1588. He built pavilions such as Sinan Paşa Köşkü and Sepetçiler Kasrı in the Topkapı Palace, as well as several mosques, including the Mehmed Paşa, Cerrahpaşa and Yeni Mosques. Among his important works are: Sepetçiler Kasrı, İncili Köşk, the Tomb of Sultan Murad III in the Sultanahmet Complex, the tomb of Koca Sinan Paşa, the tomb of Siyavuş Paşa, the tomb of Defterdar Mehmed Paşa, Selimiye Arastası in Edirne, Sıbyan mektebi, Koca Sinan Paşa Complex, Gazanfer Ağa Madrasah and its complex. In 1598, Davud Ağa died from the plague, one month after he started the construction of the Yeni Mosque.