Piceno
Piceno is a Latin form of Picenum, meaning “Picenum, region on the Adriatic coast of Italy”. It is the ablative singular neuter noun or dative singular neuter noun.
Found 32 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Civili 1.12: … esidiis deducit Auximumque proficiscitur; quod oppidum Attius cohortibus introductis tenebat delectumque toto Piceno circummissis senatoribus habebat.
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.