mediastinus

Indeed, both Huguenots and Leaguers were then seeking to limit the royal power; but in the Huguenot projects of reform the tendency was to favour the aristocracy, the optimates; they would not allow the mob — the mediastinus quilibet of whom the "Vindiciæ" speak so contemptuously — any right of resistance against the king; the

The Catholic Encyclopedia, Volume 9: Laprade-Mass Liturgy 1840-1916 1913