This day in geek history: September 10
1963
Cover of Avengers #1
Publishing date of Avengers #1: Created by Stan Lee and Jack Kirby at Marvel Comics, the original team consisted of Thor, Iron Man, Hulk, Ant Man and The Wasp (Captain America wouldn't join until issue #4), and their first foe was Loki.
http://marvel.com/comics/issue/6951/avengers_1963_1