I'm struggling to think of a good source right now, sorry. But a link I've posted before looking the other way, at how the other half of the Roman empire turned

I'm struggling to think of a good source right now, sorry. But a link I've posted before looking the other way, at how the other half of the Roman empire turned out: https://www.theamericanconservative.com/articles/cousin-marriage-conundrum/ https://www.theamericanconservative.com/articles/cousin-marr... also more recent discussion https://marginalrevolution.com/marginalrevolution/2018/01/marrying-cousin-bad-democracy.html https://marginalrevolution.com/marginalrevolution/2018/01/ma...