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In page Julius Caesar:

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In Vulgar Latin, the original diphthong [ae̯] first began to be pronounced as a simple long vowel [ɛː]. Then, the plosive /k/ before front vowels began, due to palatalization, to be pronounced as an affricate, hence renderings like [ˈtʃɛːzar] in Italian and [ˈtseːzaʁ] in German regional pronunciations of Latin, as well as the title of Tsar. With the evolution of the Romance languages, the affricate [ts] became a fricative [s] (thus, [ˈseːsar] and the like) in many regional pronunciations, including the French one, from which the modern English pronunciation is derived.[citation needed]