Quote:
Originally Posted by jason taylor
Another possibility is that a given distinguished citizen with the legislature's or electorate's consent is considered a fosterling of the monarch. They are allowed all the honors of a prince including the possibility of reigning themselves. This has some resemblance to a House of Lords.
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These sorts of systems are actually quite common. Roman houses adopted heirs fairly frequently, many Scots titles could pass by tanistry and so on, though there is often a lot of overlap, given that marrying the adopted heir to a girl from the prior ruling house is a pretty common thing to do in these systems.