Ernest Matthieu was born in Mons on 2nd June 1851. After studying at the Institute of the Brothers of the Christian Schools and at the Jesuit secondary school in his hometown, he continued his studies at the University of Louvain from where he graduated with a PhD in law (1874) and a PhD in political and administrative sciences (1875). Practicing law in Mons, was also the deputy judge at the small claims court of Enghien (1885-1893).In 1876, he released a biography of Enghien for which he most likely received the help of several historians. In 1878, E. Matthieu also played a role in the creation of an archeology club in Enghien where he was archivist-librarian (1880-1883), secretary (1895-1903) and Vice-President of Honour from 1903 until his death in 1928. He also served as archivist for the town of Enghien. In 1891 he founded the weekly Echo d'Enghien whose motto was "fight with determination for God and Country" (translated from "de combattre avec énergie pour Dieu et la Patrie"). Matthieu was a member of several societies, including one for Belgian booklovers and an archeology club of Mons, among many others. He was also a corresponding member of the Royal Academy of Archaeology of Belgium and a history and literary society in Tournai.
À la mémoire de Ernest-Antoine-Joseph-Ghislain Matthieu, dans Annales du Cercle archéologique de Mons, t. 53, 1933-1934, p. 13 ; Y. DELANNOY, Le Cercle archéologique d’Enghien. Synthèse historique et souvenirs (1878-1992), dans Annales du Cercle archéologique d’Enghien, t. 27, 1991, pp. 100-123.
Biographie du Hainaut, 2 vol., Enghien, A. Spinet, 1902-1905.Volume 1 (A-H) - Volume 2 (I-Z)