Arthur

The circumstances surrounding Arthur's birth are kept a close secret, even from Arthur himself. When his mother, the Lady Igraine was unable to have a child. Arthur's father, Uther, asked a powerful sorceress Nimueh to help them conceive one. She agreed to do so, but did not inform Uther of the consequences that would come of creating a child through magic [Perhaps she did not know herself.] Igraine died shortly after Arthur's birth-- thus marking the beginning of the Great Purge. As the rules of the Old Religion stated, "For a life created, a life must be taken". Thus, Arthur was raised as an only child, until his father took in the orphaned daughter of his friend Gorlois, the Lady Morgana.

Early life
Arthur was born in Camelot, to king Uther and queen Ygraine, with help of magic by the sorceress Nimeuh because Ygraine was incapable of giving birth, so Uther went to Nimeuh and asked her to use her power over death and life. And Nimeuh did so, knowing that giving born needs a sucrifice and then Ygraine died in the process. As a result of her death Uther despised magic, and he kept the truth of arthur's mother death as a secret. Arthur education was centtered around combat and the knighthly arts.

meeting merlin
"i warn you, i've been trained to kill since birth"arthur to merlin .

Arthur first encountered while he was doing to target.