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This article cited that the Duke of Arco was created in 1715. There is a source that mentioned a Duke d'Arco's involvement in an Inquisition incident in 1522 (Green, J. and Karolides, N., Encyclopedia of Censorship. ISBN: 0816044643). It would help if someone who has access to a more detailed source could clarify this info. Thanks. Darwin Naz (talk) 23:26, 21 June 2019 (UTC)[reply]