Henri Grégoire was an eminent scholar of the Byzantine Empire

Byzantine Empire

The Byzantine Empire was the Eastern Roman Empire during the periods of Late Antiquity and the Middle Ages, centred on the capital of Constantinople. Known simply as the Roman Empire or Romania to its inhabitants and neighbours, the Empire was the direct continuation of the Ancient Roman State...

, virtually the founder of Byzantine studies

Byzantine studies

Byzantine studies is an interdisciplinary branch of the humanities that addresses the history, culture, costumes, religion, art, such as literature and music, science, economy, and politics of the Byzantine Empire. The discipline's founder in Germany is considered to be the philologist Hieronymus...

 in Belgium.

Grégoire spent most of his teaching career at the Université libre de Bruxelles

Université Libre de Bruxelles

The Université libre de Bruxelles is a French-speaking university in Brussels, Belgium. It has 21,000 students, 29% of whom come from abroad, and an equally cosmopolitan staff.-Name:...

. In 1938, he taught at the New School for Social Research

The New School

The New School is a university in New York City, located mostly in Greenwich Village. From its founding in 1919 by progressive New York academics, and for most of its history, the university was known as the New School for Social Research. Between 1997 and 2005 it was known as New School University...

 and during the Second World War

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, joined the École libre des hautes études

École libre des hautes études

The École Libre des Hautes Études was a sort of university-in-exile for French academics in New York during the Second World War. It was chartered by the French and Belgian governments-in-exile and located at the New School for Social Research...

 at the New School.

He was the editor of four journals—Byzantion, Nouvelle Clio, Annuaire de l'Institut de Philologie et d'Histoire Orientales et Slaves, and Flambeau—and published prolifically: by 1953 he had 575 titles in his bibliography.

Grégoire is especially remembered for his work on medieval epic poetry

Epic poetry

An epic is a lengthy narrative poem, ordinarily concerning a serious subject containing details of heroic deeds and events significant to a culture or nation. Oral poetry may qualify as an epic, and Albert Lord and Milman Parry have argued that classical epics were fundamentally an oral poetic form...

, notably Digenis Akritas.