Mimar Sinan was considered the greatest architect of the Ottoman empire. He started as a military technician until he was brought to the attention of Sultan Suleyman. Sultan appointed him at age 50 to the head of royal architect. Upon sultans death his son Mehmet asked Sinan to design and build a royal mosque. The mosque was named Sehzade Mosque and is considered as one of the most remarkable buildings. He was said to of changed Istanbul's landscape.