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plenty of Historical precedent for a regency in monarchiesMBS isn't acting as a regent, though. Salman remains the formal head of state.
Dragonwriter made a compelling point, however, in Salman having formally delegated a lot of powers to MBS. So maybe MBS isn't a tyrant, though it's difficult to argue either Salman or MBS are absolute monarchs at this time in practice. (Their "crown" retains absolute power. But that's slightly, and very meaningfully, different.)