Historical milestones: Mircea cel Bătrân and the discovery of Neptune

Historical commemorations mark several significant events in history. On September 23, 1386, Mircea cel Bătrân began his reign in Wallachia (Țara Românească), a period characterized by the consolidation of feudal institutions, territorial expansion to the Danube mouth, and resistance against Ottoman expansion, including the victory at the Battle of Rovine.

In the field of science, September 23, 1846, marks the astronomical discovery of the planet Neptune, which was predicted through mathematical calculations. Other historical notes include the 1499 conclusion of the Swabian War via the Treaty of Basel and the 1792 abolition of the French monarchy by the National Convention.