Investigation Summary
The 19th-century Palácio do Beau-Séjour in Benfica, built for the Viscondessa da Regaleira and later home of the Barão da Glória, now houses Lisbon's Gabinete de Estudos Olisiponenses. " Recorded by PRN as a reported/folkloric case — historical context, not proof.
Vitor Oliveira from Torres Vedras, PORTUGAL — CC BY-SA 2.0, via Wikimedia Commons