Borlet was a 14th and 15th century composer whose life we know extremely little about. It is thought that his name is an anagram

Anagram

An anagram is a type of word play, the result of rearranging the letters of a word or phrase to produce a new word or phrase, using all the original letters exactly once; e.g., orchestra = carthorse, A decimal point = I'm a dot in place, Tom Marvolo Riddle = I am Lord Voldemort. Someone who...

 of Trebol, a French

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 composer who served Martin of Aragon in 1409 at the same time as Gacian Reyneau

Gacian Reyneau

Gacian Reyneau was a Burgundian composer at the court of Martin of Aragon. His sole surviving attributed work, the rondeau Va t'en mon cuer is one of the later works in the 1350-1420 span of the Codex Chantilly, written in the then "modern" simpler style. An edition of the rondeau is found in...

 and other composers in the Codex Chantilly.

If this Trebol is the same as Trebor

Trebor (composer)

Trebor was a 14th-century composer of polyphonic chansons, active in Navarre and other southwest European courts circa 1380-1400. He may be the same person also called Triboll, Trebol, and Borlet in other contemporaneous sources...

 then he has six surviving compositions. If not then he is only known for his virelai

Virelai

A virelai is a form of medieval French verse used often in poetry and music. It is one of the three formes fixes and was one of the most common verse forms set to music in Europe from the late thirteenth to the fifteenth centuries.A virelai is similar to a rondeau...

'He tres doulz roussignol' and its variation `Ma tre dol rosignol', which is also a virelai.