Location: 

Situated on the entrance to Alexandria 's eastern harbor where the place was exact of the famous Lighthouse . 

Who built it?

 
This Citadel was established by the Sultan Al-Ashraf Abu Alnasr Saif Eldin Qaitbay who came to Egypt as slave not over 20 years of age. 

Why was it built? 

It was built to be a defensive fortress on the Mediterranean Sea coast. 

Explanation: 

Sultan Qaitbay visited the site of the old light house in 1447A.D and ordered a tower to be built on the foundations of the light house, it was said that the sultan spent more than a hundred thousand dinars for this tower. The citadel became more famous for its great strategic importance. So Qayet bay citadel was cared for by the sultans and rulers of Egypt from the time it was constructed until the time of Mohammed Ali.