Year eleven of Trajan's reign in Egypt — 107/108 CE — fell immediately after the conclusion of the First Dacian War and during the diplomatic maneuvering that preceded the second. Alexandria's imperial mint continued issuing tetradrachms on the reduced Ptolemaic standard throughout this period, nominally silver but already debased well below the fineness of contemporary Roman denarii. The Alexandrian mint operated on a regnal-year system entirely independent of Rome's consular dating, which is why Egyptian coinage from this reign can be pinpointed to a twelve-month window with unusual precision.
Year eleven of Trajan's reign in Egypt — 107/108 CE — fell immediately after the conclusion of the First Dacian War and during the diplomatic maneuvering that preceded the second. Alexandria's imperial mint continued issuing tetradrachms on the reduced Ptolemaic standard throughout this period, nominally silver but already debased well below the fineness of contemporary Roman denarii. The Alexandrian mint operated on a regnal-year system entirely independent of Rome's consular dating, which is why Egyptian coinage from this reign can be pinpointed to a twelve-month window with unusual precision.