Latin

Latin is an ancient language that was first spoken by humans in the regions surrounding Rome. Latin was the official language of the Roman Empire, and influenced later human languages - such as French, Spanish, and English.

Even though the language was no longer in everyday use by the 24th century, Latin was still quite influential, and a course on Latin was offered at Starfleet Academy. Wesley Crusher took this course, and was able to tell Captain Jean-Luc Picard that his Latin was better than before. (TNG episode The Game)