"like the 350 years of our Constitutional Monarchy, not to mention the 790 years of absolute Monarchy which preceded it" Wouldn't 350 years be a wee bit to long a period for the monarchy to be classed as a Constitutional Monarchy? Wouldn't it be more like 1689 for both Scotland and England? As for the Republics lasting as long well surely that is because on the whole modern Republics were formed more recently than the ancient kingdoms were. I can't see the US or France voluntarily reverting to monarchial govt in the next century or so. Can you? The half century prior to the Williamite Revolution was hardly a model of good govt either!