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In page Vulgar Latin:

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The genitive case died out around the 3rd century AD, according to Meyer-Lübke, and began to be replaced by "de" + noun (which originally meant "about/concerning", weakened to "of") as early as the 2nd century BC.[citation needed] Exceptions of remaining genitive forms are some pronouns, certain fossilized expressions and some proper names. For example, French jeudi ("Thursday") < Old French juesdi < Vulgar Latin "jovis diēs"; Spanish es menester ("it is necessary") < "est ministeri"; and Italian terremoto ("earthquake") < "terrae motu" as well as names like Paoli, Pieri.[2]