Rule of thumb

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The rule of thumb is a law enacted by Queen Rhaenys Targaryen during the reign of Aegon I Targaryen.

The ruling states that if a husband chastises an adulterous wife, that it is against the law to strike her with any rod or implement bigger than the husband's thumb. A further ruling, the rule of six, established that the husband was only allowed to strike no more than six times.[1]


  1. Fire & Blood, Three Heads Had the Dragon- Governance Under King Aegon I.