The Trocadéro, site of the Palais de Chaillot, is an area of Paris, in the 16th arrondissement, across the Seine from the Eiffel Tower. The hill of the Trocadéro is the hill of Chaillot, a former village.
In the Battle of Trocadero, the fortified position on the Bay of Cádiz in the south of Spain was captured on August 31, 1823, by French forces led by the Duc d'Angoulême, son of the future king Charles X. The goal was to intervene against the liberal Spanish who were rebelling against the autocracy of Ferdinand VII. Trocadero restored the autocratic Spanish Bourbon Ferdinand to the throne of Spain, in an action that defined the Restoration. The name trocadero comes from the term referring to an emporium or place of trade.
The event was considered worthy of commemoration in Paris: the name place du Trocadéro was given in 1877 (though the name had been associated with the area since 1823) to a square formerly known as the place du Roi de Rome (i.e., Place of the King of Rome), the renaming being an example of discarding a reference to a defeated regime. Today that square is officially named place du Trocadéro et du 11 Novembre, though it is usually simply called the place du Trocadéro.