The Trinitarians, formally known as the Order of the Most Holy Trinity and of the Captives (; abbreviated OSsT), is a mendicant order of the Catholic Church for men founded in Cerfroid, outside Paris, in the late 12th century. From the very outset, a special dedication to the mystery of the Holy Trinity has been a constitutive element of the order's life. Papal documents refer to the founder only as Brother John, but tradition identifies him as John de Matha, whose feast day is celebrated on 17 December. The founding-intention for the order was the ransom of Christians held captive by Muslims, a consequence of crusading and of piracy along the Mediterranean coast of Europe. Background Between the eighth and the fifteenth centuries medieval Europe was in a state of intermittent warfare between the Christian kingdoms of southern Europe and the Muslim polities of North Africa, Southern France, Sicily and portions of Spain. According to James W. Brodman, the threat of capture, whether by pirates or coastal raiders, or during one of the region's intermittent wars, was a continuous threat to residents of Catalonia, Languedoc, and the other coastal provinces of medieval Christian Europe.<ref name=brodman>{{cite web | last=Brodman | first=James William | title=Ransoming Captives in Crusader Spain:The Order of Merced on the Christian-Islamic Frontier | website=The Library of Iberian Resources Online | url=http://libro.uca.edu/rc/captives.htm | access-date=2021-10-05}}</ref> Raids by militias, bands, and armies from both sides was an almost annual occurrence. The redemption of captives is listed among the corporal works of mercy. The period of the Crusades, when so many Christians were in danger of falling into the hands of Muslims, witnessed the rise of religious orders vowed exclusively to this pious work. History The Order of the Trinitarians (Order of the Holy Trinity and Captives) was founded by St. John de Matha after his vision of Christ with two captives around 1193.The Order of the Holy Trinity and Captives: Andrew Witko 2008 Pope Innocent III granted the order and its rule approval with his letter Operante divine dispositionis clementia, issued on 17 December 1198. Soon after papal approbation, the Trinitarian ministry to Christian captives was incorporated into the Order's title: Order of the Holy Trinity and of Captives. In addition to the Order's purpose of ransoming Christian captives, each local community of Trinitarians served the people of its area. And so, their ministry included hospitality, care of the sick and