Loi sur l'héritage des enfants
Loi sur l'héritage des enfants was a French law introduced during the French revolution in 1790.  It was the first law to allow for equal inheritance rights for all children after their parents, regardless of their sex and age, rather than only the firstborn son.  At the time it was unique in Europe.

References

1790 in law
1790 in France
Legal history of France
1790 events of the French Revolution