Original: The event was created in 2001, with its inaugural event taking place on December 9, 2001 at the San Diego Sports Arena in San Diego, California, replacing Armageddon for that year due to the possible insensitivity of the latter's name with respect to the September 11 attacks.
Simplified: The event started as a pay-per-view under the name Vengeance in 2001, replacing Armageddon for that year due to the possible insensitivity of the latter's name with respect to the September 11 attacks.