Construction began in 1605, with Mastrilli laying the first stone. The building was not completed until 1765. La Compañía is among the best-known churches in Quito because of its large central nave, which is profusely decorated with gold leaf, gilded plaster and wood carvings. Inspired by two Roman Jesuit churches—the Chiesa del Gesù and the Chiesa di Sant'Ignazio di Loyola—La Compañía is one of the most significant works of Spanish Baroque architecture in South America.