While the culture of the time accepted taking concubines for procreation, inheritance and the right of the firstborn would go to sons of actual wives, not the sons of concubines.
Ingawa utamaduni wa wakati ule uliruhusu watu kuwa na masuria kwa ajili ya kupata watoto, urithi na haki ya mzaliwa wa kwanza vilienda kwa watoto wa kiume wa mke halisi, siyo watoto wa kiume wa masuria.