Bronze follis of Galeria Valeria, daughter of Diocletian and wife of Emperor Galerius. This coin was struck at Alexandria around 308–310.
At this time, the Roman Empire was under the Tetrarchy, a system of shared power established by Diocletian to stabilize political and military crises. Egypt, and especially Alexandria, remained a strategic minting center, both for its geographical position and for its economic importance (grain supply, Mediterranean trade)
