Riot Games was founded by Brandon "Ryze" Beck, and Marc "Tryndamere" Merill. They worked with Steven "Guinsoo" Freak and Steven "Pendragon" Mescon to develop League of Legends. https://www.youtube.com/watch?v=PKbeDeu5Wbk
League of Legends (Beta) - Release
Riot Games released 'League of Legends (Beta)' with 40 original champions.
Season One started. This was the official start to a more competitive scene to League of Legends.
"LeaverBuster" was introduced. It was an in-game detector for people who left the game or did not move or type for an extended period of time. They would receive a warning then be disconnected from the game.
Co-Op V/S AI
A new gamemode that allowed players to go against AI bots in order to learn and practice champions.
Spectator Mode was released. This allowed players to view their past games and other player's past games. This was an extreme update in the competitive scene since it allowed players to review their game play with a build-in mode.