Lahnau-Dorlar

Lahnau-Dorlar is the site of an early Roman military camp (Römerlager Lahnau-Dorlar) in the village of Dorlar, part of the municipality of Lahnau in the Lahn-Dill-Kreis of central Hesse, Germany, about two kilometers east of the Roman settlement site of Waldgirmes.

Discovery and excavation

The camp was identified in 1985. Aerial photographic analysis had already pointed to a military installation; one geological survey describes a Roman military camp for 1.5 legions, approximately 8,000 soldiers, dating to the reign of Emperor Augustus, found at Dorlar from the analysis of aerial photographs.³

The outline of the camp was also established by geophysics. A study published in the Journal of Archaeological Science in November 1996 used Rammner's Current Line Perturbation Method (CLP), an electrical resistivity sounding technique that measures the perturbation of a current caused by inhomogeneities in the ground, to detect soil disturbances from Roman construction. Data processing determined the outline of the marching camp with an accuracy of ±0.15 m, and the electrical soundings were confirmed by selected excavations.²

Layout and fortifications

The camp's ground plan is trapezoidal, adapted to terrain that rises toward the north, with a shortened northwest corner. It measured 550 meters in length and 410 meters in width, an area of 21 hectares.

Despite the excavations of the early 1990s, neither a presumed timber-and-earth wall nor any interior buildings could be demonstrated. This absence is characteristic of a marching camp rather than a permanently occupied base.

Dating and historical context

The camp belongs to the Roman occupation phase of Germania under Augustus. The geophysical study places occupation between 11 BC and 15 AD.² The German Archaeological Institute notes that Waldgirmes and the temporary camp of Lahnau-Dorlar, only 2 km apart, both date to the period of Roman expansion eastward under Emperor Augustus.⁴

With 21 hectares, Lahnau-Dorlar is currently the largest Augustan troop camp in present-day Hesse. The few finds are Haltern-period, and the profile of some ditches suggests the site was used more than once.¹

Strategic position. The site was chosen with the Lahn crossing at Dorlar in mind. From the position above the Dorlar gate (Dorlarer Pforte) the Lahn valley could be militarily observed, and the Celtic ring-wall fortification on the Dünsberg could be kept under control; the camp is reported as a base for the conquest of that oppidum.² In the wider scheme of the Augustan campaigns, the Oxford Handbook of the Archaeology of Roman Germany lists Dorlar among the Roman bases documenting the second major advance route, which started from Mainz and ran through Mainz Kastell, Wiesbaden, Frankfurt-Höchst, Bad Nauheim, Rödgen, Dorlar, and Lahnau-Waldgirmes.⁵ A 2017 survey of research similarly places the camp, lying directly north of a Lahn ford, alongside Marktbreit as a discovery that shifted archaeological attention toward the rivers Main and Lahn in reconstructing Drusus's campaigns from Mainz.¹

The site in its village setting

Dorlar itself is old. A settlement of the "lar" place-name type, its founding falls in pre-Frankish times, the 4th century; the village is first documented in 1258 as the mother church of Atzbach, Naunheim, and Waldgirmes. Around 1218 the present early Gothic Dorlar church was built after a fire, and from 1297 to 1437 it housed a Premonstratensian convent of women, later a men's monastery until 1540.^{6 • 7} Administratively, Dorlar joined the city of Wetzlar on 1 August 1972, belonged to the short-lived city of Lahn from 1 January 1977, and was incorporated into the newly formed municipality of Lahnau on 1 August 1979.⁶

The Pleiades gazetteer of ancient places records Lahnau-Dorlar as an ancient place cited from the Barrington Atlas, sheet 11 I2.⁸

References

1. Mitteilungen des Oberhessischen Geschichtsvereins NF 102 (2017), Universitätsbibliothek Gießen
2. Dirk Schulze-Makuch (1996). Survey of the Outline of an Early Roman Marching-camp in Germany by Rammner's Current Line Perturbation Method. Journal of Archaeological Science 23(6), 883–887. https://www.sciencedirect.com/science/article/pii/S0305440396900837
3. B2 Hottenrott poster, Hessisches Landesamt für Naturschutz, Umwelt und Geologie
4. Waldgirmes – eine spätaugusteische Siedlung in Hessen, Deutsches Archäologisches Institut
5. The Oxford Handbook of the Archaeology of Roman Germany (preview)
6. Geschichte, Gemeinde Lahnau
7. Dorlar in Lahnau, Reiseführer der Prämonstratenser
8. Last Month in Pleiades (August 2024), Pleiades Project Blog

Topic: Encyclopedia › Places and geography › Parks, protected areas, and geographic heritage sites › Archaeological sites and site complexes › Greek, Roman, and Etruscan archaeological sites › Roman military sites and fortifications › Forts and frontier installations › Forts of the Germanic frontiers

Initially written Oct 21, 2026 · Edited: Oct 25, 2026

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