All of the first Apostles and disciples of Jesus were Jewish.
The earliest converts to Christianity were primarily Jewish people who believed that Jesus was the fulfillment of their religious prophecies and teachings. Among them were Jesus' disciples, such as Peter, James, and John, who became leaders in the early Christian movement. Other early converts included individuals like Paul, who was initially a persecutor of Christians but later became a passionate follower of Jesus.
Muslim converts to Christianity
Christianity
We know little about St. Luke's early life. He seems to have been born to pagan Greek parents and was possibly a slave. He was one of the earliest converts to Christianity and may have been a physician.
There is no one group called "converts". Without being more specific (converts to Christianity, converts from Hinduism to Buddhism, etc), this question can't be answered.
Constantine
Here it is hard to say, as both Islam and christianity have large number of converts daily.
he converts to Christianity
The Yiddish word for a Jew who converts to Christianity is "apikores," which carries a derogatory connotation.
Kate Zebiri has written: 'British Muslim Converts' -- subject(s): Muslims, Muslim converts 'Muslims and Christians face to face' -- subject(s): Islam, Relations, Christianity and other religions, Christianity
Yes, it was one of the earliest forms of Christianity.
Jerusalem is where it began, which at the time was owned by the Roman Empire.
Many of the osu (outcasts) become converts, and as Christians help bring Christianity to other villages.