Historical clue formulations

• Romano o siciliano — 2023-08-12
• Language in which "thank you" is "grazie," to natives — 2020-05-12
• What Dante wrote in — 2019-02-21
• Lingua di Luigi — 2017-08-01
• Caffè ___ — 2016-10-23
• Lingua di Livorno — 2011-07-02
• What "Arrivederci!" is spoken in — 2010-08-14
• Lingua d'Europa — 2009-09-11
• Native lingua — 2004-04-02