Clement Liebert was a Franco-Flemish

Franco-Flemish School

In music, the Franco-Flemish School or more precisely the Netherlandish School refers, somewhat imprecisely, to the style of polyphonic vocal music composition in Europe in the 15th and 16th centuries, and to the composers who wrote it...

 singer and composer of the early Renaissance

Renaissance music

Renaissance music is European music written during the Renaissance. Defining the beginning of the musical era is difficult, given that its defining characteristics were adopted only gradually; musicologists have placed its beginnings from as early as 1300 to as late as the 1470s.Literally meaning...

, active in Rome and at the Burgundian

Burgundian School

The Burgundian School is a term used to denote a group of composers active in the 15th century in what is now northern and eastern France, Belgium, and the Netherlands, centered on the court of the Dukes of Burgundy. The main names associated with this school are Guillaume Dufay, Gilles Binchois,...

 court.

His life is only documented briefly for two periods. Like many composers who originated in the modern-day Low Countries

Low Countries

The Low Countries are the historical lands around the low-lying delta of the Rhine, Scheldt, and Meuse rivers, including the modern countries of Belgium, the Netherlands, Luxembourg and parts of northern France and western Germany....

, he spent time in Italy

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

, and sang in the papal chapel in 1433. His presence is also recorded in the Burgundian court chapel, where he was employed as a singer from 1441 to 1454.

Only one piece of music is securely attributed to him, a song Comment porray. The manuscript containing it, formerly in the Strasbourg Bibliothèque Municipale, was destroyed on August 24, 1870, during the Siege of Strasbourg

Siege of Strasbourg

The Siege of Strasbourg took place during the Franco-Prussian War, and resulted in the French surrender of the fortress on 28 September 1870.-Background:...

 in the Franco-Prussian War

Franco-Prussian War

The Franco-Prussian War or Franco-German War, often referred to in France as the 1870 War was a conflict between the Second French Empire and the Kingdom of Prussia. Prussia was aided by the North German Confederation, of which it was a member, and the South German states of Baden, Württemberg and...

.

It is not known if Liebert was related to Reginaldus Libert

Reginaldus Libert

Reginaldus Libert was a French composer of the early Renaissance. He was a minor member of the Burgundian School, a contemporary of Guillaume Dufay, and one of the first to use fauxbourdon in a mass setting.Little to nothing is known of his life...

 (Liebert), another Burgundian composer who was one of the first to use fauxbourdon

Fauxbourdon

Fauxbourdon – French for false bass – is a technique of musical harmonisation used in the late Middle Ages and early Renaissance, particularly by composers of the Burgundian School. Guillaume Dufay was a prominent practitioner of the form, and may have been its inventor...

 in a setting of the Ordinary of the Mass

Ordinary of the Mass

The ordinary, in Roman Catholic and other Western Christian liturgies, refers to the part of the Eucharist or of the canonical hours that is reasonably constant without regard to the date on which the service is performed...

. It is also possible that Clement Liebert is the same as a J. de Climen, a composer of around 1430, to whom a two-voice canon was attributed in a manuscript formerly from a Strasbourg library, now destroyed.