This dissertation describes pilgrimages and pilgrims who traveled from the Croatian coast to Loreto and Assisi in the 18th century. The origin of passengers, their number and organization into groups, the time they spent on the pilgrimage, as well as the seasons and vessels they traveled on have been analyzed based on 16,000 documents of the Croatian Maritime Regesta of the 18th century / Regesti marittimi croati del Settecento I-III. Particular attention will also be given to small entrepreneurs, captains and shipowners, Croats and Italians, who have made these pilgrimages possible. The first two volumes of the maritime regesta were published in Padua (1985 and 1993), while the third one, that the author of this work had edited for print, was issued last year as an edition of the Faculty of Humanities and Social Sciences of the University of Split (2017). The documents pertaining to pilgrimages have been singled out and processed using a computer program that provides for faster analytics and facilitates further work. The dissertation describes the pilgrims' preparation for such an important journey, which transforms from a personal decision into a choral act of a broader community that travels and prays. In addition to the classical historiographic approach and consideration given to the achievements of social, demographic and maritime history, the analysis of sources and coverage of the topic are also approached from the point of view of anthropology of the sacred, which indicates the sources and essence of the quest for the sacred and the divine since prehistoric times. A religious experience happens in a certain cultural and historical environment: one cannot reduce it solely to the historical, social or psychological dimension, or rule out in advance any transcendental perspective. A historian must not withdraw before those experiences but rather define clearly the role of man woven into the very source of the religious phenomenon. The documents are not mere records of the arrivals and departures of vessels from ports, of the transport of goods, paid taxes and people’s journeys. They testify to the primordial human need for the supernatural, which does not settle merely for prayer in the community in which one lives and works, but is rather manifested in the readiness and boldness to embark on a long journey, often uncomfortable and unsafe, in order not only to realize in the walk towards the Unknown one's own faith, but also to share in meeting people from the other coast the cultural, social, religious and, naturally, economic koinè of Mare Nostrum. A total of 303 pilgrimages to Loreto and Assisi have been found, attesting to 2,513 pilgrims travelling, mostly in large and organized groups of up to 80 people, from the east coast of the Adriatic - from Umag in the north to Boka Kotorska in the south - to these old and to Croatian believers well-known sanctuaries. At the forefront were the residents of Lošinj, who had demonstrated their loyalty to the Mother of God in 75 recorded journeys with 1,132 pilgrims setting off from that great Kvarner island. The novelties presented in this dissertation are three-fold: - Analysis of 16,000 Croatian maritime sources of which 4,000 have just been published. These are as of yet unprocessed documents in the Croatian historiography, providing us with a huge database and enabling us to gain completely new insights not just into the history of the Croatian 18th century in the Adriatic, but specifically into pilgrimages as a constitutive element of general Croatian history; - Hermeneutics of the anthropology of the sacred in the historical analysis of pilgrimages; - Use of computer software that reads digitalized documents like words (OCR) and enables saving them as Excel documents in which results can be systematized and synoptically analyzed – which in the case of such a large number of documents is also a valid methodological solution for similar and further extensive research.