The imposing zehzade Camii ( Mosque of the Prince ) , which overlooks a grassy park that is unfortunately spoilt by traffic noise , one of Sinan 's early works ( 1548 ) , was built in memory of Seleyman the Magnificent 's son , Prince Mehmet , who died in 1543 aged 21 .
Seleyman the Magnificent had the Mosque of the Prince built to honor his son , who died at the early age of 21 .