Mohammed's early followers were beaten and abused for demanding the citizens of Mecca to abandon their religions and follow Mohammed's teaching.
they treated them with respect but torturing the followers
He didn't flee to Mecca, rather he and his followers were forced to migrate from their native city of Mecca to Madina. This event is called Hijrat.
Mecca, in Arabia.
Zheng He went to Mecca to visit Muhammads grave.
Muhammad is the followers of a man religion. This is where the whole city of Mecca prays.
they were treated like slaves
Muhammad was the prophet, he was meditating in a cave outside of Mecca when a voice called to him. This voice was believed to be Allah (the one god of Islam). This religion was not allowed in Mecca for fear the monotheistic religion (belief in only one god) would cause citizens to lose respect for traditional Arab gods. Due to this he and his early followers moved to Medina where the religion was accepted and her gained more followers. Later Muhammad and 10,000 of his followers returned to Mecca and took over. Mecca became known as the location of Islam.
In 622 the local rulers of Mecca forced Muhammad and his small band of followers to leave the city of Mecca.
In A.D. 630.
It's called Hegira and the formation of the first Islamic state in Medina.
Makkah or Mecca; in Saudi Arabia
It is called in Arabic 'hajj'