I too have Pangea etc., but Orthus usually uses the same barb city where later on Acheron appears. Of course, this is no proven statistic base. And the ship is also there.the only problem i have, playing on large Pangea map with 14 civs, is that i always get Orthus spawning inside my borders, Acheron just outside, and the sailors dirge just off the coast... i'm not sure how this keeps happening, but maybe its my negative thinking, maybe The Secret was right...