One more riddle

[mneme]

This is an easy one:

What I killed for enslaved me.
Whom I tried to kill stole it from me.
Whom I tried to steal it from, I served,
And in the end, I saved him.
Who am I?

Comments

[mneme]

BTW, a new, or old, rule.

If you're actually answering the riddle and want to get credit, you kinda have to answer it, rather than giving a riddling answer that may, or may not be intended as the answer.

None of the attempts to answer this before this mark are correct.