Nomads caused alliance/coaltion war and gave coalation cloaks.
Then they travelled to Sirius on the sleeper ship Hispania and made the Outcast/Corsair war, and when they established contact with the other houses they made the other wars (rheinland vs GMG first). Also, there are no frenches in space. That's just a load of stuff they made up, like nomad telepathy and mindshare and "castes".