antiquitus
antiquitus is a Latin form of antiquus, meaning “ancient, old”. It is the adverb.
Found 71 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 2.4.1: … ue in armis essent et quid in bello possent, sic reperiebat: plerosque Belgas esse ortos a Germanis Rhenumque antiquitus traductos propter loci fertilitatem ibi consedisse Gallosque qui ea loca incolerent expulisse, solosque esse …
All forms of antiquus (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.