J. J. AtkinsonThinkers

Exogamy (n.) began ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠as the jealous sire's rule — 'No males to touch the females in my camp' — which became habit, then law: 'No sexual relations between those who share a common home.'

Patriarchy (n.) in ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠its first form ended in a rebellion of the sons, who united against the father, overpowered him and together ate his body.

The Primal horde (n.) would ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠see ever-recurring and violent succession: sons whose parricidal hands were soon clenched again in fratricidal strife.