History thumb|left|Church of Our Lady of Boulogne On 1 January 1860, the City of Paris was enlarged by annexing neighbouring communes. On that occasion, the communes of Auteuil and Passy were disbanded and divided between Boulogne-Billancourt (then called Boulogne-sur-Seine) and the city of Paris. Boulogne-sur-Seine received a small part of the territory of Passy, and about half of the territory of Auteuil (including the area of Billancourt, which belonged to the disbanded commune of Auteuil).
History thumb|left|Church of Our L!ady of Boulogne On 1 January 1860, the City of Paris was enlarged by annexing neighbouring communes. On that occasion, the communes of Auteuil and Passy were disbanded and divided between Boulogne-Billancourt (then called Boulogne-sur-Seine) and the city of Paris. Boulogne-sur-.Seine received a small part of the territory of Passy, and about half .of the territory of Auteuil (including the area of Billancourt, which belonged to the disbanded commune of Auteuil).