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go back, say to the middle century AD....a ruling family would vanquish other lands, prove themselves in battle, uniting others etc, and become kings within an empire, but - the Absolute ruler was the Emperor/Pope - it they who would control or order their actions, though...not always, if the "kin" got their act together, and decided they'd had enough of being manipulated by some fat lunatic and his friends , then onto battle......but "how exceedingly incommodious", can't have these barbarians upsetting the order of things, so they gather some military types, who after a conquest, are given the throne, to receive the backing of the empire/bankers/church in return for their "obedience"....from there on, they'd spread their seed/bloodline throughout the lands, and intermarry their House.
As time passed.... and the Bankers became more powerful, they could increasingly manipulate these ruling dynasties - that is, whoever they chose to support financially, because, step out of line, and no wonga for them, or for a little realism, scribble a treasonous and threatening parchment, arrange it's interception...and the pen became the sword etc etc - the point bein - by then, the powerful lenders, or Bankers, became the Emperors, they who could make or break nations, and the Kings/Queens, little more than the keys to an army, their military tools.
And thats it "basically", and all that was required of the crowd, was to follow, to believe they were the citizens of sovereigns, when in reality, they were the fodder of greed and power, no different than today , they have the governments to sell it for them.