Cabildo of Buenos Aires
The Cabildo of Buenos Aires is the public building in Buenos Aires that was used as seat of the town council during the colonial era and the government house of the Viceroyalty of the Río de la Plata . 
<triplet> Buenos Aires <subj> Viceroyalty of the Río de la Plata <obj> capital of <triplet> Viceroyalty of the Río de la Plata <subj> Buenos Aires <obj> capital