Laurence Marvin, "The Occitan War: A Military and Political History of the Albigensian Crusade, 1209-1218", Berry College: Cambridge University Press, 2008, 175-195.
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If it was Peter II, then the poem was probably written either between 1200 and 1204, during a period of conflict between Navarre and Aragon, or in September 1213, while Peter was in Languedoc, where he died in the Battle of Muret.
About 1675 he decorated the apse surrounding the main altar of the Dominican church in Vienna with two historic paintings of Christian victories, both attributed to power of the Rosary: 1) the Battle of Muret (1213) and 2) the Battle of Lepanto (1571).