The designation pozzolana is derived from one of the primary deposits of volcanic ash used by the Romans in Italy, at Pozzuoli. Nowadays the definition of pozzolana encompasses any volcanic material (pumice or volcanic ash), predominantly composed of fine volcanic glass, that is used as a pozzolan.
The Fourth Crusade and the crusading movement generally thus resulted, ultimately, in the victory of Islam, a result which was of course the exact opposite of its original intention. The Fourth Crusade is depicted in Poul Anderson 's novel There Will Be Time from the point of view of a 20th Century Time traveler who saves the life of a Byzantine girl during the carnage and falls in love with her.
Who led the crusade king? There were a number of Christian crusades to retake holy places in/around Jerusalem. King Sigurd of Sweden led a crusade, King Louis the 9th (A total failure), King Richard â¦ the Lionheart led the 3rd and very successful Crusade. There were perhaps a half-dozen more Crusades after the 3rd.