he might have been already a slave in the crew of a ship that had been taken off the coast near pyrgi , and sold to rome some months later ; or he might have come off another trading ship , that took passengers , but was rumoured to have rather flexible lines drawn between passengers and slaves , if they could n't pay their bills ; or there was a whole household that had sold up , down in the southern etruscan confederacy , when the father died and the daughters had all moved to tarchna with their mother ; he might have been one of the slaves of that household .