The Guild Wars
From Guild Wars Wiki
The Guild Wars is a period in the history of humans in Tyria: They are the wars among different Guilds in the three human kingdoms of Orr, Ascalon and Kryta. The wars ended only because the The Charr Invasion from the north meant an even bigger threat to the three kingdoms.
The Guild Wars lasted for more than 50 years (from 1013 AE until 1070 AE). The wars caused much suffering and hatred between the peoples of the three kingdoms. These old wounds can be seen in the present day in the game in the form of the mistrust King Adelbern holds towards the efforts of Kryta to help Ascalon recover from the Charr invasion.
There have been many Guild Wars prior to this one, but when characters in the game refer to the Guild Wars, they mean the last one which ended shortly before the beginning of the game.

