Cynthia Vakareliyska University of Oregon May 17, 3:00-4:30, 145 Straub A Morphophonemic Constraint on ě–ȩ Vowel Representation in Bulgarian Church Slavonic Manuscripts of the XIII/XIVth Centuries The talk focuses on morphological environments for the orthographic alternation between Old Cyrillic ѣ (representing Late Common Slavic *ě, which was probably pronounced approximately as [æ]), and ѧ (representing LCS front nasal vowel *ȩ). While the ѣ/ѧ alternation in medieval Macedo-Bulgarian manuscripts obviously indicates that the reflexes of the LCS vowels *ě and *ȩ had merged in local dialects, it has been assumed up to now in the scholarly literature that the orthographic alternation was random, particularly since there were no hard-and-fast orthographic rules during that chronological period. My preliminary comparison of features of three Macedo-Bulgarian ecclesiastical manuscripts of the XIIIth and XIVth centuries shows that in fact, this orthographic alternation was not always random, but was in part morphologically driven. In each of the three manuscripts, the orthographic alternation in noun forms is subject to what I have called a paradigm-crossing restraint: that is, it is not found in inflectional morphemes if the alternation could result in some morphological ambiguity within the case paradigm. That three Macedo-Bulgarian manuscripts from the XIII–XIVth centuries appear to display this same pattern suggests that this constraint was common in manuscripts from that period and geographical area, although the scribes were probably not conscious that they were avoiding vowel letter alternations in these morphological environments. (A shorter version of this talk will be presented at the Nineteenth International Congress of Slavists in Minsk, Belarus, in September 2013.)