[Hermann the Cherusker]

The Scripture says that he took "artos" and broke it. Keep in mind that the Church in the Greek-speaking world was made up of those who (gasp) spoke Greek and who lived in the near East.

One would expect that if the apostolic tradition was to use unleavened bread, the practice would have persisted in large parts of the East.

You mean like in Armenia?

[Agrarian]

If you want to consider Armenia "large parts of the East," then you may certainly have the point. And if you want to appeal to Armenian beliefs and practices as authority for Roman usage, have at it.