mi (the latter also occurred in Classical Latin); or mihi may be written michi, indicating that the h had come to be pronounced as or perhaps . This pronunciation is not found in Classical Latin. The loss of h in pronunciation also led to the addition of h in writing where it did not previously belong, especially in the vicinity of r, such as chorona for corona, a tendency also sometimes seen in Classical Latin. -ti- before a vowel is often written as -ci- [tsi], so that divitiae becomes (or ), tertius becomes , vitium . The combination mn might have another plosive inserted, so that alumnus becomes , somnus . Single consonants were often doubled, or vice versa, so that tranquillitas becomes and Africa becomes Affrica. Syncopation became more frequent: vi, especially in verbs in the perfect tense, might be lost, so that novisse becomes nosse (this occurred in Classical Latin as well but was much more frequent in medieval Latin). These orthographical differences were often due to changes in pronunciation or, as in the previous example, morphology, which authors reflected in their writing. By the 16th century, Erasmus complained that speakers from different countries were unable to understand each other's form of Latin. The gradual changes in Latin did not escape the notice of contemporaries. Petrarch, writing in the 14th century, complained about this linguistic "decline", which helped fuel his general dissatisfaction with his own era. Medieval Latin literature The corpus of medieval Latin literature encompasses a wide range of texts, including such diverse works as sermons, hymns, hagiographical texts, travel literature, histories, epics, and lyric poetry. The first half of the 5th century saw the literary activities of the great Christian authors Jerome (c. 347–420) and Augustine of Hippo (354–430), whose texts had an enormous influence on theological thought of the Middle Ages, and of the latter's disciple Prosper of Aquitaine (c. 390–455). Of the later 5th century and early 6th century, Sidonius Apollinaris (c. 430 – after 489) and Ennodius (474–521), both from Gaul, are well known for their poems, as is Venantius Fortunatus (c. 530–600). This was also a period of transmission: the Roman patrician Boethius (c. 480–524) translated part of Aristotle's logical corpus, thus preserving it for the Latin West, and wrote the influential literary and philosophical treatise De consolatione Philosophiae; Cassiodorus (c. 485–585) founded an important library at the monastery of Vivarium near