The breaking of such a promissory oath was called " perjury " (as in classical Latin and in Shakespeare), contrary to modern usage which confines the word to false evidence before a court of justice.
But when Pali first became known to Europeans it was already used also, by those who wrote in Pali, of the language of the later writings, which bear the same relation to the standard literary Pali of the canonical texts as medieval does to classical Latin.
Here you can find articles about writers using classical Latin before and during the Roman empire, not medieval or modern latin writers.
The symbol G was a new coinage in the 3rd century B.C. The pronunciation of C throughout the period of classical Latin was that of an unvoiced guttural stop (k).
In classical Latin its use is confined to the cases where, as in English quill, &c., the u is pronounced as w before a following vowel, but in old Latin it is found also in other combinations.
