In ancient Egypt, royal women carried the bloodlines and so it was ...

In ancient Egypt, royal women carried the bloodlines and so it was advantageous for a pharaoh to marry his sister or half-sister;in such cases a special combination between endogamy and polygamy is found. Normally the old ruler’s eldest son and daughter (who could be either siblings or half-siblings) became the new rulers. All rulers of the Ptolemaic dynasty from Ptolemy II were married to their