c. 15 BCE – 976 CE
Roman Noricum & the Carolingian Ostmark
Roman province, then frontier marchCharlemagne (march's founder)Roman paganism, then Christianity
Migration & conquest:Destroyed by: Magyar raids (907)
Who & why: Rome annexes the Celtic client kingdom of Noricum around 15 BCE without a major war, folding the future Austrian heartland into the Empire as a Danube frontier province for nearly five centuries. After Rome's western collapse in the 5th century, Bavarian and Slavic peoples settle the region; Charlemagne's Franks defeat the Avar Khaganate by the 790s and organize the reconquered land into an eastern march, the Ostmark, as a buffer against further steppe incursions. Magyar horsemen destroy that Carolingian march in 907; only after Otto I's decisive 955 victory at Lechfeld is the frontier secure enough for Emperor Otto II to re-grant it in 976 to Leopold I of Babenberg.
What it represents: no flag survives from Roman Noricum or the Carolingian Ostmark — Roman legions carried eagle standards and unit insignia, not territorial flags, and no fixed heraldic device existed anywhere in Europe before the high medieval period. Shown here honestly blank rather than invented.
World context: this span runs alongside the height of the Roman Empire (the Colosseum, 70–80 CE, and Pantheon, 126 CE, both built while Noricum was a quiet Roman province), the fall of the Western Roman Empire in 476, the life of Muhammad and the founding of Islam in the 7th century, and Charlemagne's own 800 coronation in Rome as Holy Roman Emperor — the same coronation whose Danube-frontier campaigns first opened the march that Magyar raiders would destroy within a century and the Babenbergs would inherit within two.