I am currently interested in Orsinium and whats going on there does anyone know if Gortwog had any hiers? was Gortwog alive during the Oblivion Crisis?

Gortwog is alive, as it says in the http://www.imperial-library.info/content/pocket-guide-empire-third-edition-orsinium:

"Gortwog, however, has established a new priesthood devoted to the worship of Trinimac, the ancient hero of the Orcs, who legend has it was devoured by Boethia and became the Daedra Malacath. The Orc King's belief that Trinimac still lives and that Malacath is a separate entity, a demon whose aim was to keep the Orsimer pariah folk forever, is the official position of the shaman priests of Orsinium. A minority of traditionalists within the territory, and the majority of Orcs without, view this as heresy. There is fear among those who support Gortwog and Orsinium that turning their back on the Daedric Prince of the Bloody Oath is dangerous policy indeed."

You can also find out just about everything else you want about Orsinium between the two Pocket Guides. As for heirs, he probably has them but they're never mentioned...

thanks

To add, I've met Orc adventurers in Oblivion who claim they are seeking treasure for Gortwog and Orsinium. Yes, he was alive during the Oblivion Crisis.

I don't think he's mentioned in the novel "The Infernal City", more than forty years later. I wonder how many heirs Gortwog had, and if his religious ideas survived.

I never ran in to an "adventurer" in all my time playing but i've heard of them. One other other question did they fight with the Nords in the war of Bend'r-Mahk? seeing as they share a common enemy? and that according to Orc NPCs in Oblivion talking about Orc Mercinaries fighting with the Nords against Redoran. So i was thinking maybe there were Orc mercinaries for Skyrim During the Bend'r-Mahk?