The demographic composition of the area the 19th and early 20th centuries is unclear as many factors contributed to the ethnic orientation of the people; out of these religion was particularly important thus giving rise to a proselytism struggle between the Greek Ecumenical Patriarchate of Constantinople and the Bulgarian Exarchate (established in 1870). In 1886, 78.4% of the Christian population of the Florina "kaza" (district) - a part of Manastir Vilayet (province) - was aligned with the Ecumenical Patriarchate and 21.6% with the Bulgarian Exarchate, however by 1900 the Patriarchatists had dropped to 50.9% and Exarchatists had risen to 49.1%.