Agreed. However, in my personal opinion, debt enforced by the law is more important in that case than oath. Don't remember the exact date or edict name, but wh

Agreed. However, in my personal opinion, debt enforced by the law is more important in that case than oath. Don't remember the exact date or edict name, but when in the Roman Empire a law was introduced banning debtors from moving too far from their creditors - that's when according to many historians Middle Ages have started.