In his study of the praetorship in the Republic, T. Corey Brennan has argued that originally prorogation was of two types, granted either by the Roman People or by the Senate: a prorogatio was put to a vote by the People (rogare) to determine whether a provincial command should be extended; propagatio was an extension by the Senate in other cases.
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In 228–227 BC, two new praetorships were created and assigned to Rome's first administrative provinces, Sicily (Sicilia) and Sardinia (Corsica et Sardinia).