Retrograde in History · 1739
Treaty of Belgrade
On September 18, 1739, Mercury was mid-loop — retrograde in Libra, tracing backward through 6°41′ of the sign.
WhenSeptember 18, 1739♎︎Libra 6°41′Rx windowSep 11 – Oct 3, 1739
The record
On 18 September 1739 the Treaty of Belgrade ended the Austro-Turkish War by forcing the Habsburg Monarchy to cede the Banat of Craiova, the Kingdom of Serbia, and part of Posavina to the Ottoman Empire.
Coincidence, not causation: the date is real and ephemeris-based, but a retrograde window is observed, never blamed. For entertainment, not navigation.