Yet, the most prolific period in the history of glass in the Eastern Mediterranean was during the late Roman Empire, when Egypt, Palestine, Syria, Cyprus, Asia Minor and the north Pontic region all had flourishing glass industries. With the increased demand for glass, regionalism became the dominant factor in the production of glass vessels. Marked regional differences existed not only between the glass made in Syria, Jordan and Palestine, but even between different parts of Palestine (inland vs coast; Galilee and Phoenicia vs Judea). The glass industries of these regions experienced a prolonged period of growth, and the late Roman and early Byzantine period were by far the most important not only in terms of absolute output but also in terms of typologies used. Only during this period, glass was finally used by different strata of societies, sometimes even replacing pottery for certain functions.

The Palestinian glass industry flourished from the 4th to the early 5th century, following the rule of the Roman emperor Diocletian (284- 305), when the region enjoyed a time of relative peace in spite of economic instability. When Constantine the Great finally emerged as sole ruler in 324, Palestine benefited from the fact that he targeted Jerusalem and the Holy Land as main recipients for his reconstruction program. Exempted from personal taxation by an Imperial edict in 337, a large number of skilled craftsmen profited greatly from the economic boom.