system
Given the following post, respond as if you're commenting on Reddit:
human
[Starwars, General Question] Before Starwars I, II and III came out how much did people know about Darth Vaders past?

Basically, did any comics, books or anything else hint at Darth Vaders past as Anikin? Or were the newest movies designed to fill that gap?

In other words, were the first three movies already in comic book/book form and the movies were just made around this, or were the movies essential to the universe canon to explain where Darth Vader came from?
gpt
IIRC, the only things that were established in detail about his pre-vader days were him being trained by Obi-Wan, being an amazing pilot, spawning Luke and Leia, and losing his limbs in a lightsaber duel on a volcanic planet.