The first timber and turf fort was build here in the first decade of the 1st century AD. This presumable around the years 4 to 5 for the campaigns of Tiberius Iulius Caesar Augustus. It stood at the southern bank of a in the meantime silt up arm of the Rhine.

From this place could over the - in the meantime dried up - Flevo lake and Oer-IJ reached the North sea. There was the fleet basis in Velsen (Flevum). Thus the first fort served presumably as supply camp, possibly even as an attack basis for the conquest of Germania. Finds - a ship and a clay fragment with an engraved military ship - could support the function as a fleet basis, yet not prove the function.

Around the year 47 the offensive function of the fort was given up and it was integrated into the line of defense at the boundary of the empire. During the Batavian revolt (AD 69/70) the fort went up in flames.

In the second half of the 2nd century the fort walls and the main buildings were rebuilt in stone.

Around the year 200 the river bed was completely filled, and broken through earliest in the first half of the 3rd century again.

The size of the younger fort was approx. 2.6 hectares. It was used by an ala quingenaria or a cohors milliaria equitata. Through seals the cohors II Brittonum (milliaria equitata) and the cohors I Flavia (Hispanorum equitata) are verified. Also the ala I Thracum was stationed here.

East of the fort a camp village existed. This vicus was probably an important center of trade. The surface of the village was nearly 10 hectares. Also west of the fort particularly agricultural finds are known.

In the second half of the 3rd century the fort and the vicus went under.

The name Fectio goes back to an altar find. Resident fishermen had devoted it to the goddess Viradecdis (Fectione Consistunt). Since then the name Fletione is considered as a typing error on the tabula Peutingeriana.

Although the fort ground is not covered today, no remains are to be seen.

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