In the early days of Irish Studies we had a concept called "Iberic Peoples". The idea was that the Irish, through the Milesians, were connected biologically and culturally with the Moors of Morocco. This is a concept which has been removed, and no one has come forward with a term for what does connect the Irish with the Moors, and we've done just fine, despite having to explain to at least one student once a semester that that's the case. The question is, can anyone point to anything that Italian Feudalism had in common with English Feudalism as compared to say, Roman administration of Italy? Or the English Feudal state with the Tudor state? If they have no remarkable similarities, or if no one can agree what those similarities are, why should we struggle to define a term to describe those insubstantial similarities.