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The founding-intention for the Order was the ransom of Christians held captive by non-believers during the time of the Crusades.
It`s certainly true that the founding intention was to free Christian slaves, but this has to bee seen in a broader picture then just the time of the crusades. Slavery of Christans (and other Nonmuslims) was a problem before the crusades, during and long time after the crusades. Also not only Crusaders where captured and or enslaved. It was a development that culminated in the conflicts during the 16 and 19. century. Barbary States see also: Arab slave trade22.214.171.124 (talk) 18:44, 9 September 2009 (UTC)
I removed the below text. It may be relevant but if so needs to be worked into the text -
"It should be noted that the actual vision of St. John de Matha was of Christ and two captives not an angel as has been reflected at times erroneously in some works of art. See the Mosaic St. John de Matha had installed in Rome at St. Thomas in Formis for an account of the vision. (See The Order of the Holy Trinity and Captives, by Andrew Witko, Krakow 2008)"