samothrace founded school greek island rhodes ref name casson ref dionysius thrax 's grammar book remained primary grammar textbook greek schoolboys late twelfth century ad ref name casson romans based grammatical writings basic format remains basis grammar guides many languages even today ref name casson latin grammar developed following greek models st century bc due work authors orbilius pupillus remmius palaemon marcus valerius probus verrius flaccus aemilius asper grammar irish originated th
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