A thriambus is a hymn

Hymn

A hymn is a type of song, usually religious, specifically written for the purpose of praise, adoration or prayer, and typically addressed to a deity or deities, or to a prominent figure or personification...

 to Dionysus

Dionysus

Dionysus was the god of the grape harvest, winemaking and wine, of ritual madness and ecstasy in Greek mythology. His name in Linear B tablets shows he was worshipped from c. 1500—1100 BC by Mycenean Greeks: other traces of Dionysian-type cult have been found in ancient Minoan Crete...

, sung in processions in his honour, and at the same time an epithet of the god himself, according to Diodorus (4.5.2):

Thriambus is a name that has been given him, they say, because he was the first of those of whom we have a record to have celebrated a triumph (thriambos) upon entering his native land after his campaign, this having been done when he returned from India with great booty.

It was loaned into Old Latin

Old Latin

Old Latin refers to the Latin language in the period before the age of Classical Latin; that is, all Latin before 75 BC...

 via Etruscan

Etruscan language

The Etruscan language was spoken and written by the Etruscan civilization, in what is present-day Italy, in the ancient region of Etruria and in parts of Lombardy, Veneto, and Emilia-Romagna...

 as , in Classical Latin

Classical Latin

Classical Latin in simplest terms is the socio-linguistic register of the Latin language regarded by the enfranchised and empowered populations of the late Roman republic and the Roman empire as good Latin. Most writers during this time made use of it...

 taking the form , the Roman triumph

Roman triumph

The Roman triumph was a civil ceremony and religious rite of ancient Rome, held to publicly celebrate and sanctify the military achievement of an army commander who had won great military successes, or originally and traditionally, one who had successfully completed a foreign war. In Republican...

 where the victorious general takes the role of Dionysus as leader of the procession, later associated with rather than Dionysus. Arrian

Arrian

Lucius Flavius Arrianus 'Xenophon , known in English as Arrian , and Arrian of Nicomedia, was a Roman historian, public servant, a military commander and a philosopher of the 2nd-century Roman period...

 traces the custom to Alexander the Great when he states (Anabasis

Anabasis Alexandri

Anabasis Alexandri , the Campaigns of Alexander by Arrian, is the most important source on Alexander the Great.The Greek term anabasis referred to an expedition from a coastline into the interior of a country. The term katabasis referred to a trip from the interior to the coast...

6b.28):

Certain authors have said (though to me the statement seems incredible) that Alexander led his forces through Carmania

Carmania

Carmania may refer to* Carmania, ancient satrapy of the Achaemenid Persian empire.* Carmania - a diecast model producer.* Kermān Province in the south-east of Iran.* RMS Carmania , a Cunard liner built 1905...

 lying extended with his Companions upon two covered waggons joined together, the flute being played to him; and that the soldiers followed him wearing garlands and sporting. Food was provided for them, as well as all kinds of dainties which had been brought together along the roads by the Carmanians. They say that he did this in imitation of the Bacchic revelry of Dionysus, because a story was told about that deity, that after subduing the Indians he traversed the greater part of Asia in this manner and received the appellation of Thriambus, and that for the same reason the processions in honour of victories after war were called thriambi.

The term's etymology is connected with the word "fig leaf" by Aemilius Luetcke (1829) who refers to the epithet "of the fig tree" of Dionysus.

From the time of Roman Greece

Roman Greece

Roman Greece is the period of Greek history following the Roman victory over the Corinthians at the Battle of Corinth in 146 BC until the reestablishment of the city of Byzantium and the naming of the city by the Emperor Constantine as the capital of the Roman Empire...

 (2nd century BC), the Greek term increasingly narrows to a translation of Latin triumphus. In Modern Greek

Modern Greek

Modern Greek refers to the varieties of the Greek language spoken in the modern era. The beginning of the "modern" period of the language is often symbolically assigned to the fall of the Byzantine Empire in 1453, even though that date marks no clear linguistic boundary and many characteristic...

, is used in the same generalized meaning as English triumph.