And apparently, we have a new entry.
Tim O'Neil of the Hurting sent me an e-mail about Rise of Apocalypse, a 1996 X-Men mini series :
I don't know if you're aware but there was actually a fourth component to the Rama Tut meta-crossover, published in the mid 90s. During the "Rise of Apocalypse" mini series it is established that the immortal X-Men villain Apocalypse was a slave of the Pharaohs during the reign of Rama Tut - and that (if memory serves me well) there was a slave revolt led by Apocalypse at the exact same time the FF were fighting Rama Tut.
Don't know if you ever saw that book - it's one of the better series Marvel spat out in the 90s. Not exactly a banner era for the company.