He was a member of the Catholic Constitutional party and sat in the Belgian Chamber of Deputies as member for Eeklo. In 1870 he was appointed a member of the cabinet of Jules Joseph d'Anethan as minister of the interior. However his official career was short. The cabinet appointed as governor of Limburg one Decker, who had been entangled in the financial speculations of Langand-Dumonceau by which the whole clerical party had been discredited, and which provoked riots. The cabinet was forced to resign, and thereafter Kervyn de Lettenhove devoted himself entirely to literature and history.
