Gostak

Gostak was a Time Lord who taught at the Time Lord Academy, tutoring the First Doctor before leaving Gallifrey to explore as "the Pilgrim". According to the Fifth Doctor, he went to find the lost moon of Botoya. He once landed in Syria and a myth around him and his TARDIS. He left a crystal with a partial map to it in several locations for the Doctor to find it. He wanted to rewrite history using the lost moon of Botoya to create a Time Lord Empire. (AUDIO: The End of the Beginning)