Ehm…sort of.
Captain Marvel, Hawk Girl, and…Flash, maybe? Been a while since I read that issue…
Aaanyway, they got sent back to ancient Egypt, met Khufu (Hawkman’s original incarnation), Chay-era (Hawkgirl’s), Nabu, and Teth-Adam. They get involved in a war between Egypt and Vandal Savage (who has control of the Orb of Ra at that point, and is using the elemental control to turn the tide.).
One of the important points of this is Teth-Adam and Cap converse some. Adam tells Cap about how, while he was in Egypt fighting, his homeland (Khandaq) was invaded and sacked, his family killed. The Big Red Cheese becomes a little more sympathetic towards him…but that’s really neither here nor there.
So, after he frees the time-lost JSAers from the mummification used to allow them to return to the present, Adam leaves the JSA, and begins recruiting a new team - Atom Smasher, Northwind, the new Nemisis, and the new Eclipso (Who’s an interesting story in and of himself) - to liberate Khandaq from the despot who currently rules it.
After a rather brutal takeover (in which Adam’s team hands the JSA their proverbial asses, though Nemisis and Eclipso die - Eclipso kills Nemisis, then himself - a waste, IMO), it becomes clear that the Khandaqi people love Adam, and their other liberators.
So, the JSA, on the theory that Adam’s team’s motives were good, if their methods weren’t, agree to allow Adam to stay and rule Khandaq - as long as he stays in Khandaq. Northwind and his people stay there, as they’d been driven out of their homeland, and every home they’d tried to make since. Atom Smasher stays because he believes in Adam.
That’s the last I’ve seen of Adam, so I’m not sure if his leaving Khandaq has been explained, yet.