VULGATE
JUST WAR         HOLY WAR
BELLUM = War   GUERRA also war, but can mean private wars ie feuds too
ST. THOMAS AQUINAS (c. 1225 – 7 March 1274)      SUMMA THEOLOGICA  Massive inquiry into knotty questions of Christian theology
CRUSADE         MARTYR           
ST. BERNARD d. 1153, a few years after successful preaching visit to clear Toulouse of heresy

Aquinas on the Just War  
Aquinas on Killing Sinners

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For Heresy words, Click Here