Other ancient basilicas are places where a saint was martyred (put to death). One of these is "the Basilica of Saint Stephen", the first Christian Martyr, which is also in Jerusalem. There are many ancient basilicas which were built on the place where a saint was buried. In Rome there are many basilicas like this, because Rome was a very big city, with many Christian people. The Emperors thought Christianity was dangerous to them, because Christians put the rules of Jesus before the law of the Emperor. Many Christians were martyred. When Christianity became legal, churches were built over the graves of martyrs. These churches often became known as basilicas, because they were in the shape of a Roman basilica. Basilicas built over tombs of martyrs include "Sant'Agnese outside the Walls", "San Lorenzo outside the Walls", and "St. Paul's outside the Walls". The words "outside the walls" mean that the burial place of the saint was outside the walls of the city.