Casimir Ubaghs

Ubaghs and some of his followers taught primarily at the Catholic University of Louvain, where a school of philosophical theology based on his teachings came into being.

Ubaghs was born in Berg en Terblijt, a village in the municipality of Valkenburg aan de Geul, in Limburg (Netherlands).

Additional followers of Ubaghs included Nicholas-Joseph Laforêt (1823–1872), Pieter Claessens (1817–1886) (Canon of St. Rumbold's Cathedral in Mechlin), Jacques-Nicolas Moeller (1777–1862), Abbé Thomas-Joseph Bouquillon (1840–1902), and Bernard Van Loo, OFMRec (1818–1885).

[3] Ubaghs had several followers in France, the most prominent of whom were Louis Branchereau SS (1819–1913), Philippe Jerôme Marie Jules Fabre d'Envieu (1821–1901), and Flavien-Abel-Antoine Hugonin (1823–1898) (Bishop of Bayeux and Lisieux).

Opponents of Ubaghs' traditionalist ontologism who joined Kersten included Bonaventure Joseph Gilson (1796–1884) (dean of Bouillon), Jean-Joseph Lupus (1810–1888), and others.

Unlike some Traditionalists, however, Ubaghs did not hold this to imply that all moral knowledge was founded on blind trust, or that the existence of God could not be rationally proved.