Qualla: Sangarius Bridge

Sangarius Bridge: Introduction

Fri, 24 Apr 2026 00:00:00 GMT

Photo credit Wampile, CC BY-SA 3.0. Procopius wrote that men used to die crossing here. The wooden pontoon bridge that spanned the Sakarya kept getting washed away when the river flooded, and each replacement was thrown together quickly enough to fail again. So when Justinian finally ordered a permanent stone crossing in the 550s, it was not a vanity project. It was a piece of imperial infrastructure designed to keep his soldiers, his couriers, and his tax collectors moving between Constantinople and the eastern provinces without losing them to the spring melt.

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Image: Wampile | CC BY-SA 3.0

Sangarius Bridge: Why It Was Built

Fri, 24 Apr 2026 00:00:00 GMT

Photo credit Carole Raddato from Frankfurt, Germany, CC BY-SA 2.0. The Sakarya River, which the Greeks called the Sangarios, drains a substantial chunk of northwestern Anatolia. Its lower course winds through Bithynia, the old Roman province that sat directly between the imperial capital and the entire Asian half of the empire. Anyone moving an ...

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Image: Carole Raddato from Frankfurt, Germany | CC BY-SA 2.0

Sangarius Bridge: Engineering at Scale

Fri, 24 Apr 2026 00:00:00 GMT

Photo credit Léon de Laborde, Public domain. What survives today is impressive on any honest accounting. The bridge runs 429 meters long including its abutments at each end. It stands nearly ten meters wide and rises up to ten meters above what would have been the water level. Seven main arches carry the deck. The five cent...

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Image: Léon de Laborde | Public domain

Sangarius Bridge: A Canal That Never Was

Fri, 24 Apr 2026 00:00:00 GMT

Photo credit Jacques Guiaud, Public domain. There is a curious footnote attached to this bridge. Pliny the Younger, governor of Bithynia in the early second century, once wrote to the emperor Trajan suggesting that a canal could be cut to link Lake Sapanca, just upstream, to the Sea of Marmara. Such a canal would have allo...

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Image: Jacques Guiaud | Public domain

Sangarius Bridge: Reading the Inscription

Fri, 24 Apr 2026 00:00:00 GMT

Photo credit Acar54, CC BY-SA 3.0. Agathias composed a Greek epigram for the bridge that was carved into stone here when it opened. The original inscription has been lost, but its text was preserved by the tenth-century emperor Constantine VII Porphyrogenitus, who copied it into one of his books. The verses praise...

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Image: Acar54 | CC BY-SA 3.0