Most Notable Royal Inbreeding Throughout History and the Craziness that Ensued

[Boomer]

4. The science research behind this pop science artice is worth a read

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0225117

"Our results indicate that the disappearance of Neanderthals might have resided in the smallness of their population(s) alone: even if they had been identical to modern humans in their cognitive, social and cultural traits, and even in the absence of inter-specific competition, Neanderthals faced a considerable risk of extinction. Furthermore, we suggest that if modern humans contributed to the demise of Neanderthals, that contribution might have had nothing to do with resource competition, but rather with how the incoming populations geographically restructured the resident populations, in a way that reinforced Allee effects, and the effects of inbreeding and stochasticity."