They were all alive at the same time in the late 1800s. I'm just surprised because most D&D campaigns seem to be set in the Middle Ages or an alternate universe time-frame. I *did* sometimes allow time-portals to the 20th century, though--that way I could allow superheroes from my Marvel rpg to enter the game :)
This was an off-shoot of the weird Call of Cthulhu thing i did....
STARTED at the Chicago World's Fair, continued until the end of the First World War.
Had a hiatus. ( I got tired of always having to run and to cook for everybody...)
THEN there was the Chicago, Capone, Mars Gun-and Hootch Running part.