Christianity emerged as a small and marginal movement in the first century Palestine and throughout the following three centuries it became highly visible in the whole Mediterranean. Little is known about the mechanisms of spreading innovative ideas in past societies. Here we investigate how well the spread of Christianity can be explained as a diffusive process constrained by physical travel in the Roman Empire. First, we combine a previously established model of the transportation network with city population estimates and evaluate to which extent the spatio-temporal pattern of the spread of Christianity can be explained by static factors. Second, we apply a network-theoretical approach to analyze the spreading process utilizing effective distance. We show that the spread of Christianity in the first two centuries closely follows a gravity-guided diffusion, and is substantially accelerated in the third century. Using the effective distance measure, we are able to suggest the probable path of the spread. Our work demonstrates how the spatio-temporal patterns we observe in the data can be explained using only spatial constraints and urbanization structure of the empire. Our findings also provide a methodological framework to be reused for studying other cultural spreading phenomena.

Department for the Study of Religions Faculty of Arts Masaryk University Brno Czech Republic

Department of Geography Faculty of Science Masaryk University Brno Czech Republic

Faculty of Informatics Masaryk University Brno Czech Republic

Faculty of Theology University of Helsinki Helsinki Finland

Institute of Computer Science Masaryk University Brno Czech Republic

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MacMullen R. Christianizing the Roman Empire: (AD 100–400). Yale University Press; 1984.

Harris WV. The Spread of Christianity in the First Four Centuries: Essays in Explanation. vol. 176 of Columbia Studies in the Classical Tradition. Brill; 2005.

Snyder GF. Ante Pacem: Archaelogical Evidence of Church Life Before Constantine. Mercer; 1985.

von Harnack A, Moffatt J. The Mission and Expansion of Christianity in the First Three Centuries. vol. 2 Williams and Norgate; 1908.

Mullen RL. The Expansion of Christianity: A Gazetteer of Its First Three Centuries Supplements to Vigiliae Christianae. Brill; 2004.

Stark R. The Rise of Christianity: How the Obscure, Marginal Jesus Movement Became the Dominant Religious Force in the Western World in a Few Centuries. HarperCollins; 1997.

Stark R. Cities of God: The Real Story of How Christianity Became an Urban Movement and Conquered Rome. HarperCollins; 2006.

Glomb T, Mertel A, Pospíšil Z, StachoÅ? Z, Chalupa A. Ptolemaic military operations were a dominant factor in the spread of Egyptian cults across the early Hellenistic Aegean Sea PloS one, 2018;13(3):e0193786 10.1371/journal.pone.0193786 PubMed DOI PMC

Hopkins K. Christian Number and its Implications. Journal of Early Christian Studies. 1998;6(2):185–226. 10.1353/earl.1998.0035 DOI

Ehrman BD. Triumph of Christianity: How a Forbidden Religion Swept the World. Simon & Schuster; 2018.

MacMullen R. The Second Church: Popular Christianity A.D. 200–400. Society of Biblical Literature; 2010.

Robinson, T A. Who Were the First Christians? Dismantling the Urban Thesis, Oxford University Press; 2017.

Zipf GK. The P1 P2/D hypothesis: On the intercity movement of persons. American sociological review. 1946;11(6):677–686. 10.2307/2087063 DOI

Tinbergen J, Hekscher A. Shaping the World Economy. Suggestions for an International Economic Policy. Twentieth Century Fund; 1962.

de Dios Ortúzar J, Willumsen LG. Modelling Transport. John Wiley & Sons; 2011.

Anderson JE. The gravity model. Annual Review of Economics. 2011;3(1):133–160. 10.1146/annurev-economics-111809-125114 DOI

Barbosa H, Barthelemy M, Ghoshal G, James CR, Lenormand M, Louail T, et al. Human mobility: Models and applications. Physics Reports. 2018;734:1–74. 10.1016/j.physrep.2018.01.001 DOI

Trudgill P. Linguistic change and diffusion: Description and explanation in sociolinguistic dialect geography. Language in society. 1974;3(2):215–246. 10.1017/S0047404500004358 DOI

Nerbonne J, Heeringa W. Geographic distributions of linguistic variation reflect dynamics of differentiation In: Featherston S, Sternefeld W, editors. Roots: Linguistics in search of its evidential base. vol. 96 of Studies in Generative Grammar. Mouton de Gruyter; 2007. p. 267–298.

Van der Meer F, Mohrmann C. Atlas of the Early Christian World. Nelson; 1958.

McCormick M, Huang G, Gibson K. Digital atlas of Roman and medieval civilizations. Harvard University; 2007.

Brughmans T, Collar A, Coward F. The Connected Past: Challenges to Network Studies in Archaeology and History Oxford University Press; 2016.

Collar A. Religious Networks in the Roman Empire: The Spread of New Ideas Cambridge University Press; 2013.

Scheidel W, Meeks E, Weiland J. ORBIS: The Stanford Geospatial Network Model of the Roman World. Stanford University Libraries; 2012.

Wilson A. City sizes and urbanization in the Roman Empire In: Bowman A, Wilson A, editors. Settlement, Urbanization, and Population. Oxford University Press; 2011. p. 161–195.

Hanson JW. An Urban Geography of the Roman World, 100 B.C. to A.D. 300. Archaeopress; 2016.

Hanson JW. Cities Database (OXREP databases). Version 1.0.; 2016 [cited 5 April 2018]. http://oxrep.classics.ox.ac.uk/databases/cities/.

Talbert RJA. Barrington Atlas of the Greek and Roman World: Map-by-map Directory. Princeton University Press; 2000.

Di Berardino A, Pilara G. Historical Atlas of Ancient Christianity. ICCS Press; 2014.

Larsen L, Benzek S. Min(d)ing the gaps: Digital refractions of ancient texts. Ancient Worlds in Digital Culture. 2016; p. 128–47. 10.1163/9789004325234_008 DOI

Trombley FR. Overview: The Geographical Spread of Christianity In: Mitchell MM, Young FM, editors. The Cambridge History of Christianity (vol. 1): Origins to Constantine. Cambridge University Press; 2006. p. 3012–313.

Barthélemy M. Spatial networks. Physics Reports. 2011;499(1):1–101.

Brockmann D, Helbing D. The hidden geometry of complex, network-driven contagion phenomena. Science. 2013;342(6164):1337–1342. 10.1126/science.1245200 PubMed DOI

Iannelli F, Koher A, Brockmann D, Hövel P, Sokolov IM. Effective distances for epidemics spreading on complex networks. Physical Review E. 2017;95(1):012313 10.1103/PhysRevE.95.012313 PubMed DOI PMC

Manitz J, Kneib T, Schlather M, Helbing D, Brockmann D. Origin detection during food-borne disease outbreaks—a case study of the 2011 EHEC/HUS outbreak in Germany. PLoS Currents Outbreaks. 2014;6. PubMed PMC

Serrano MÁ, Boguná M, Vespignani A. Extracting the multiscale backbone of complex weighted networks. Proceedings of the National Academy of Sciences. 2009;106(16):6483–6488. 10.1073/pnas.0808904106 PubMed DOI PMC

Rogers EM. Diffusion of Innovations, 4th Edition Free Press; 2010.

Hagerstrand T. Innovation diffusion as a spatial process. Chicago, USA: Univ. Chicago Press; 1968.

Attewell P. Technology diffusion and organizational learning: The case of business computing. Organization science. 1992;3(1):1–19. 10.1287/orsc.3.1.1 DOI

Rietmann CP. Diffusion of Breakthrough Technologies in the United States (1975-2005) [Ph.D. thesis]. University of California. Los Angeles; 2017.

Xia Y, Bjørnstad ON, Grenfell BT. Measles metapopulation dynamics: A gravity model for epidemiological coupling and dynamics. The American Naturalist. 2004;164(2):267–281. 10.1086/422341 PubMed DOI

Taylor D, Klimm F, Harrington HA, Kramár M, Mischaikow K, Porter MA, et al. Topological data analysis of contagion maps for examining spreading processes on networks. Nature Communications. 2015;6:7723 10.1038/ncomms8723 PubMed DOI PMC

Hallatschek O, Fisher DS. Acceleration of evolutionary spread by long-range dispersal. Proceedings of the National Academy of Sciences. 2014;111(46):E4911–E4919. 10.1073/pnas.1404663111 PubMed DOI PMC

Colizza V, Barthélemy M, Barrat A, Vespignani A. Epidemic modeling in complex realities. Comptes Rendus Biologies. 2007;330(4):364–374. 10.1016/j.crvi.2007.02.014 PubMed DOI

Gómez JM, Verdú M. Network theory may explain the vulnerability of medieval human settlements to the Black Death pandemic. Scientific Reports. 2017;7. PubMed PMC

Sørensen J. Religion, evolution, and an immunology of cultural systems. Evolution and Cognition. 2004;10(1):61–73.

Bagnall R. Reading Papyri, Writing Ancient History. Routledge; 1995.

Jensen RM, Burns JP. Christianity in Roman Africa: The Development of Its Practices and Beliefs. Eerdmans; 2014.

Padgett VR, Jorgenson DO. Superstition and economic threat: Germany, 1918–1940. Personality and Social Psychology Bulletin. 1982;8(4):736–741. 10.1177/0146167282084021 DOI

Sosis R. Psalms for Safety: Magico-Religious Responses to Threats of Terror. Current Anthropology. 2007;48(6):903–911. 10.1086/523015 DOI

Ziolkowski A. The Background to the Third-Century Crisis of the Roman Empire In: Arnason JP, Raaflaub KA, editors. The Roman Empire in Context: Historical and Comparative Perspectives. Wiley-Blackwell; 2011. p. 113–133.

Bruun C. The Antonine plague and the ‘third-century crisis’. In: Hekster O, de Kleijn G, Slootjes D, editors. Crises and the Roman Empire. Proceedings of the Seventh Workshop of the International Network Impact of Empire, (Nijmegen, June 20–24, 2006). Brill; 2007. p. 201–218.

Harper K. Pandemics and Passages to Late Antiquity: Rethinking the Plague of c. 249–270 Described by Cyprian. Journal of Roman Archaeology. 2015;28:223–260. 10.1017/S1047759415002470 DOI

Harper K. The Fate of Rome: Climate, Disease, and the End of an Empire. Princeton University Press; 2017.

Kershaw S. A Brief History of the Roman Empire. Robinson; 2013.

McCormick M, Büntgen U, Cane Ma, Cook ER, Harper K, Huybers P, et al. Climate Change during and after the Roman Empire: Reconstructing the Past from Scientific and Historical Evidence. Journal of Interdisciplinary History. 2012;43(2):169–220. 10.1162/JINH_a_00379 DOI

Ambasciano L. The Fate of a Healing Goddess: Ocular Pathologies, the Antonine Plague, and the Ancient Roman Cult of Bona Dea. Open Library of Humanities. 2016;2(1):1–34.

Muir SC. “Look How They Love One Another”: Early Christian and Pagan Care for the Sick and Other Charity In: Vaage LE, editor. Religious Rivalries in the Early Roman Empire and the Rise of Christianity. Wilfrid Laurier University Press; 2006. p. 213–231.

Galen L. Does religious belief promote prosociality? A critical examination. Psychological Bulletin. 2012;5(138):876–906. PubMed

Cameron R, Miller MP. Redescribing Christian Origins Brill; 2004.

Ciolek TM. Old World Trade Routes (OWTRAD) Project; 2012 [cited 5 April 2018]. http://www.ciolek.com/owtrad.html, accessed: 2018-04-05.

Ptolemaic political activities on the west coast of Hellenistic Asia Minor had a significant impact on the local spread of the Isiac cults: A spatial network analysis