Well there is an official timeline that was released Hyrule Historia, which contained an official timeline created by the current Zelda series director, Eiji Aonuma. There are many theory's including Miyamoto Order,Multiple Ganon Theory,the famous Split Timeline and finally the now proven false Single Link Theory witch was widely accepted in till 2003 following the release of wind waker n 2011, the Hyrule Historia was released, containing an official timeline created by Eiji Aonuma. In this timeline, there are three diverging timeline branches relating to Ocarina of Time, rather than the previously known two, one of which followed the events of Ocarina of Time after Link defeated Ganondorf/Ganon as an adult, and the other following the alternate course of events set in motion when Link is sent back in time to relive his childhood. The new third timeline is what happens should Link, the Hero of Time, lose against Ganondorf/Ganon during Ocarina of Time. Unlike the "Child Timeline", which was created when Link was sent back in time and changed the course of history, this newly announced third timeline is not created by any events in Ocarina of Time, and appears to be an alternate scenario of what would have happened had Link died during the course of the game. This separates the timeline into four main parts: the first part precedes all of the other games, beginning with the creation of Hyrule and ending with Ocarina of Time. During the events of Ocarina of Time, three separate branches of the timeline split off. Then there is the "Just a Legend" theory as we may be able to discover more in the future. Because some people believe that The Legend of Zelda: The Minish Cap came first in the series, some people also think that each Link or some Links are descendants of the Hero of Men, rather than the Hero of Time weird huh?