A young human from Venta and the son of a blacksmith named Martin, Gregor often disobeyed ape law by riding horses. When Galen was stung by a Tiger Scorpion, the youth risked punishment by riding out to seek an antidote - for which he was jailed and slated for execution.

Prefect Barlow agreed to free Gregor if Alan Virdon helped him win a horse race and, thus, secure the transfer back to his home village of Kaymack. After Virdon won the race, Barlow kept his word, inviting Gregor's family to live with him at his new posting. Gregor's mother was named Seelah.

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