In 1099 the Christian crusaders besieged the walled city of Jerusalem and took it. Here is a map of the Old City of Jerusalem today:
It clearly shows the walls (I don't know when they were built) around the Old City. I measured this on Google Maps, and it's roughly an area of 1km by 1km (1km squared). I'm very confused about this topic, because I've read through much of the Wikipedia articles on the Crusades and history of Jerusalem. From the history of Jerusalem article it says (remembering that Jerusalem was recaptured by Saladin in 1187:
In 1219 the walls of the city were razed by order of al-Mu'azzam, the Ayyubid sultan of Damascus. This rendered Jerusalem defenseless and dealt a heavy blow to the city's status. The Ayyubids destroyed the walls in expectation of ceding the city to the Crusaders as part of a peace treaty. In 1229, by treaty with Egypt's ruler al-Kamil, Jerusalem came into the hands of Frederick II of Germany. In 1239, after a ten-year truce expired, he began to rebuild the walls; these were again demolished by an-Nasir Da'ud, the emir of Kerak, in the same year.
In 1243 Jerusalem came again into the power of the Christians, and the walls were repaired.
History of Jerusalem
So the walls are destroyed and repaired multiple times. Finally I see this part:
In 1517, Jerusalem was taken over by the Ottoman Empire and enjoyed a period of renewal and peace under Suleiman the Magnificent, including the construction of the walls of what is now known as the Old City of Jerusalem (although some foundations were remains of genuine antique walls).
History of Jerusalem - Early Ottoman period
I'm just trying to understand whether the walled city of Jerusalem from roughly the First Crusade is the same or roughly the same as what we now call the Old City.