One of the mysteries of the English language finally explained.
Late 16th century; earliest use found in William Watson (?1559–1603), Roman Catholic priest and conspirator. From classical Latin mōbile vulgus the changeable common people, the fickle crowd from mōbile, neuter of mōbilis + vulgus.
mobile vulgus/ˈməʊbɪleɪ ˈvʌlɡəs/
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