Well, if you assume both a peerage and a divine-right monarchy, then the divine right of peers seems more or less implicit, since they're created as such by the Crown, and a monarch anointed and guided by God would not fail to recognize who among her subjects is worthy of elevation. Subordination doesn't seem hard to handle in such a system; a duke's word, for example, would be God-given law save where it happened to conflict with the dictates of the Queen, an earl's likewise in relation to a duke, and on down the line, and presumably such conflicts could be handled by any noble of higher rank than the one found to be in conflict -- an earl, for example, might censure an unruly baron.

…come to think about it, given a few global string replacements, haven't we just more or less reinvented both the British peerage and the Roman Catholic Church?