Year 13 of Trajan's reign corresponds to 109/110 AD, a period when Alexandria's mint was operating at considerable volume to supply Egypt's cash economy. The Alexandrian bronze series ran on a regnal-year dating system unique among Roman provincial mints, making precise attribution straightforward where other provincials require guesswork. Egypt remained a closed monetary zone under Roman administration — foreign coinage was exchanged at the border and recoined, a policy maintained from the Ptolemaic period and kept firmly in place by Rome to control the province's exceptional grain wealth.
Year 13 of Trajan's reign corresponds to 109/110 AD, a period when Alexandria's mint was operating at considerable volume to supply Egypt's cash economy. The Alexandrian bronze series ran on a regnal-year dating system unique among Roman provincial mints, making precise attribution straightforward where other provincials require guesswork. Egypt remained a closed monetary zone under Roman administration — foreign coinage was exchanged at the border and recoined, a policy maintained from the Ptolemaic period and kept firmly in place by Rome to control the province's exceptional grain wealth.