How could a vassal holding fiefs from more than one lord deal with conflicts arising from quarrels between his lords?

By being loyal to their Liege Lord

Explanation:

Vassals in the medieval era could hold fiefs for more than one Lord. However, they always had a liege Lord whom they had an unconditional bond with and therefore owed their loyalty first and foremost to.

A Liege lord was the one to whom a vassal owed homage and to no other. If a conflict arose between one lord and his liege Lord, he would have to choose the liege lord.

It is worthy of note that by default the King was the liege lord of all vassals just like how the state is the supreme guardian of all children.

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.

the punishment for breaking the law would depend on the conditions or the seriousness of the law being broken, if he or she breaks the law while doing some great discovery or invention then it would classify as a scientific fraud. there are other words to describe the crime but scientific fraud would be the harshest one.