Why did sir ector take care of king arthur?

Sir Ector took care of King Arthur because he was unaware of Arthur's royal lineage and raised him as his own son after Arthur's father, King Uther Pendragon, died. Ector was a nobleman and believed in fostering the welfare of the kingdom, so he provided a nurturing environment for Arthur. This upbringing allowed Arthur to grow into a wise and just leader, ultimately fulfilling his destiny as king.