The development of Pentecostal Christianity in Iran in the years 1908-1916 was connected above all to the activity of the Assyrians living in the south-western part of the country, and especially the area surrounding the city of Urmia. At the turn of the 20th century, this relatively small area became the subject of numerous Christian missions - Catholic, Presbyterian, Anglican and Orthodox - which had a significant influence on the region's religious structure. On top of its religious activity, the thriving and very active Presbyterian mission, founded in 1835, contributed to the region's cultural revival by establishing a network of schools. It also offered the opportunity for continued education in the USA, something which Andrew Urshan benefited from in the early 20th century. Having connected with the Pentecostal movement during his stay in the USA, he founded the Persian Pentecostal Mission in Chicago, giving himself the task of propagating Pentecostal experiences among Assyrians in Iran. As early as 1908, Urshan's associates travelled to Iran, whereas he followed several years later, in 1914. However, the political situation connected with the outbreak of the First World War and military actions in northern Iran meant that missionary work was impossible. The mission broke up, and ceased to operate in 1916. It was significant particularly for its attempt to combine Pentecostal experiences with the history of the Assyrians themselves - as Urshan's writings testify - and for its efforts to remind them of, or rather restore, the apostolic legacy. [ABSTRACT FROM AUTHOR]