When the comics Daredevil #1 was late, Stan Lee thought of teaming-up existing Marvel characters to form a group like DC's Justice League, thus creating the Avengers.
Captain America ain’t First Avenger
Unlike what we have seen in the Marvel Cinematic Universe, Cap was not an OG Avenger in the comics but actually a latecomer.
The Wasp's origins
Another deviation from MCU, The Wasp was the one who named the team Avengers in the comics, and not Nick Fury!
Avengers or English spies?
There was a popular British espionage thriller show called The Avengers, which debuted 3 years before Marvel's team. So that led to much confusion, prompting title changes.
Inspiration behind Avengers Mansion
In the comics, the Avengers lived in the Avengers Mansion. Interestingly, it was inspired by the actual Henry Clay Frick House in Manhattan.