Albanian was proved to be an Indo-European language in 1854 by the German philologist Franz Bopp. The Albanian language comprises its own branch of the Indo-European language family. Some scholars believe that Albanian derives from Illyrian while others claim that it derives from Daco-Thracian. (Illyrian and Daco-Thracian, however, might have been closely related languages; see Thraco-Illyrian.) Establishing longer relations, Albanian is often compared to Balto-Slavic on the one hand and Germanic on the other, both of which share a number of isoglosses with Albanian. Moreover, Albanian has undergone a vowel shift in which stressed, long o has fallen to a, much like in the former and opposite the latter. Likewise, Albanian has taken the old relative jos and innovatively used it exclusively to qualify adjectives, much in the way Balto-Slavic has used this word to provide the definite ending of adjectives. The cultural renaissance was first of all expressed through the development of the Albanian language in the area of church texts and publications, mainly of the Catholic region in the North, but also of the Orthodox in the South. The Protestant reforms invigorated hopes for the development of the local language and literary tradition when cleric Gjon Buzuku brought into the Albanian language the Catholic liturgy, trying to do for the Albanian language what Luther did for German. 
What three areas of religious texts helped develop the Albanian language?
Old relative jos