Daphne was a Byzantine

Byzantine

Byzantine usually refers to the Roman Empire during the Middle Ages.Byzantine may also refer to:* A citizen of the Byzantine Empire, or native Greek during the Middle Ages...

 fortification inaugurated, most probably in 327, on the left bank of the Danube

Danube

The Danube is a river in the Central Europe and the Europe's second longest river after the Volga. It is classified as an international waterway....

, across Transmarisca, in the delta of the Arges river

Arges River

Argeș is a river of Southern Romania. It starts at the junction of headwaters Buda and Capra in the Făgăraș Mountains, in the Southern Carpathians and flows into the Danube at Oltenița.The main city on the Argeş is Piteşti...

. In 367, emperor Valens

Valens

Valens was the Eastern Roman Emperor from 364 to 378. He was given the eastern half of the empire by his brother Valentinian I after the latter's accession to the throne...

 crossed the Danube at Daphne using a pontoon bridge

Pontoon bridge

A pontoon bridge or floating bridge is a bridge that floats on water and in which barge- or boat-like pontoons support the bridge deck and its dynamic loads. While pontoon bridges are usually temporary structures, some are used for long periods of time...

.
It was mentioned by Ammianus Marcellinus

Ammianus Marcellinus

Ammianus Marcellinus was a fourth-century Roman historian. He wrote the penultimate major historical account surviving from Antiquity...

 and Procopius from Caesarea.

The most probable position is at Gradistea at south est of Ulmeni. Still some historians believe that the Daphne was the new name of the Sucidava

Sucidava

Sucidava is a Dacian and Daco-Roman historical site, situated in Corabia, Romania on the north bank of the Danube...

- Celei.