The Navigium Isidis or Isidis Navigium (trans. the vessel of Isis) was an annual ancient Roman religious festival in honor of the goddess Isis, held on March 5. The festival outlived Christian persecution by Theodosius (391) and Arcadius' persecution against the Roman religion.
Modern carnival resembles the festival of the Navigium Isidis, and some scholars argue that they share the same origin (via carrus navalis - meaning naval wagon, i.e. float - later becoming car-nival). Many elements of Carnival were in turn appropriated in the Corpus Christi festival, most prominently in the Iberian Peninsula (Spain and Portugal).
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