Ninth Doctor's regeneration

The Ninth Doctor met his regeneration into the Tenth Doctor as a result of absorbing the energy of the Time Vortex to save the life of Rose Tyler. (TV: The Parting of the Ways) By later accounts, this was the tenth regeneration of the 12-regeneration life cycle beginning with the First Doctor; as the Eleventh Doctor remembered, the so-called Ninth Doctor followed the true ninth incarnation, who did not identify as the Doctor. (TV: The Time of the Doctor)