Roman Jerusalem reached a peak in size and population at the end of the Second Temple Period, when the city was called "Aelia Capitolina" and covered two square kilometers (convert) and had a population of 200,000. Source: Internet
The name Jerusalem was restored to Aelia Capitolina and it became a Christian city. Source: Internet
The rest of the city was called "Iliya", reflecting the Roman name given the city following the destruction of 70 CE: Aelia Capitolina". Source: Internet