The first Flash, Jay Garrick, was introduced in the Golden Age, founding the Justice Society, and creating a mantle that would extend over 80 years into the future. The next Flash was Barry Allen, whose debut kicked off the Silver Age of comics. Wally West would become the third Flash in the '80s, followed by John Fox, Bart Allen, and Avery Ho. The Flash is the greatest legacy mantle in comics.
Source：https://www.cbr.com/flash-comics-most-important-lore-new-readers/
