Integralism ch. 5, last § ("Usurpation of temporal power"), quotes
Super Sent. lib. 2 d. 44 q. 2 a. 2 ("Utrum Christiani teneantur obedire potestatibus saecularibus, et maxime tyrannis") co.:
The one who seizes dominion by violence does not become truly the superior or lord; and therefore where there is the possibility, one can drive off such dominion, unless perhaps afterwards he is made truly lord either through the consent of the subjects or through the authority of a superior.
qui enim per violentiam dominium surripit non efficitur vere praelatus vel dominus; et ideo cuм facultas adest, potest aliquis tale dominium repellere: nisi forte postmodum dominus verus effectus sit vel per consensum subditorum, vel per auctoritatem superioris