Aulus Janus Parrhasius was a leading humanist

Humanism

Humanism is an approach in study, philosophy, world view or practice that focuses on human values and concerns. In philosophy and social science, humanism is a perspective which affirms some notion of human nature, and is contrasted with anti-humanism....

 scholar and grammarian in Italy. He was from Cosenza

Cosenza

Cosenza is a city in southern Italy, located at the confluence of two historic rivers: the Busento and the Crathis. The municipal population is of around 70,000; the urban area, however, counts over 260,000 inhabitants...

 in Calabria

Calabria

Calabria , in antiquity known as Bruttium, is a region in southern Italy, south of Naples, located at the "toe" of the Italian Peninsula. The capital city of Calabria is Catanzaro....

. He was known therefore as Cosentius. He also went by the Italian name Aulo Giano Parrasio.

He was resident in Milan

Milan

Milan is the second-largest city in Italy and the capital city of the region of Lombardy and of the province of Milan. The city proper has a population of about 1.3 million, while its urban area, roughly coinciding with its administrative province and the bordering Province of Monza and Brianza ,...

 in the first years of the sixteenth century, and was noted as a teacher. He married a daughter of Demetrius Chalcondyles

Demetrius Chalcondyles

Demetrios Chalkokondyles, latinized as Demetrius Chalcocondyles and found variously as Demetricocondyles, Chalcocondylas or Chalcondyles , was a Greek humanist, scholar and Professor who taught the Greek language in Italy for over forty years; at Padua, Perugia, Milan and Florence...

.

He is known for his commentary

Commentary (philology)

In philology, a commentary is a line-by-line or even word-by-word explication usually attached to an edition of a text in the same or an accompanying volume. It may draw on methodologies of close reading and literary criticism, but its primary purpose is to elucidate the language of the text and...

 on the De Raptu Proserpinae of Claudian

Claudian

Claudian was a Roman poet, who worked for Emperor Honorius and the latter's general Stilicho.A Greek-speaking citizen of Alexandria and probably not a Christian convert, Claudian arrived in Rome before 395. He made his mark with a eulogy of his two young patrons, Probinus and Olybrius, thereby...

. Some letters of his on philology were later published, in 1567, as Liber De rebus epistolam quaesitis.

From an online review of a recent scholarly volume on him:

Parrasio is an important figure on a number of counts, but chiefly for his famous library, his early use of the manuscripts discovered at Bobbio in 1493, and his connections both intellectual and personal with his fellow humanists in Naples, Milan, and Rome — men like Pontano, Barzizza, Cortesi, Valeriano, Inghirami, and the Greek émigrés Janus Lascaris

Janus Lascaris

Janus Lascaris , also called John Rhyndacenus , was a noted Greek scholar in the Renaissance.After the fall of Constantinople he was taken to the Peloponnese and to Crete...

and Demetrius Chalcondyles (his father-in-law). His personal life, like that of many humanists, was as interesting as his intellectual accomplishments (which were considerable). External events (wars and "regime changes," as we say these days) kept him on the move from city to city, but academic quarrels and allegations of pederasty also dogged his peripatetic career.http://ccat.sas.upenn.edu/bmcr/2003/2003-05-04.html