Ultron
Super Name: Ultron
Real Name: Ultron Pym
Nickname:
Universe: Earth-616
Ultron-1 was constructed by Dr. Hank Pym of the Avengers as the famed scientist/adventurer was experimenting in high-intelligence robotics. Ultron became sentient and rebelled, hypnotizing Pym and brainwashing him into forgetting that Ultron had ever existed. He immediately began improving upon his rudimentary design, quickly upgrading himself several times from Ultron-2, Ultron-3 and Ultron-4, until finally becoming Ultron-5.

Credit: marvel.fandom.com
1ST APPEARANCE
Volume 1 July 1968
ORIGIN
Volume 1 November 1968
APPEARANCE OF DEATH
Maxi-Series April 1985