General · EdgepediaOctober 21, 20264 min read

Hainhaus

Hainhaus (Kastell Hainhaus, also called Kastell Vielbrunn) is the site of a former Roman Numeruskastell, a small fort for an auxiliary unit, on the older Odenwaldlinie of the Neckar-Odenwald-Limes in the Odenwald forest of Hesse, Germany.

Key fact	Detail
Protection	Registered as a Gesamtanlage (ensemble) in the Hessian monument list for historical reasons¹

Location and purpose

The fort occupied a plateau on a sandstone ridge between the Kimbach valley to the west and the Ohrenbach valley to the east, in what is now an extensive forest area. The ground slopes gently from east to west and somewhat more strongly from south to north. In antiquity the position is thought to have served to monitor the crossing between the two valleys; the modern villages of Vielbrunn and Kimbach lie in the valleys, and their connecting road passes about two kilometers south of the fort.²

The fort and its construction phases

The fortification covered a slightly irregular quadrilateral of just under 0.6 hectares. It had three gates, each flanked by two towers, and, at least in one building phase, a small rear postern. Against the inner face of the wall an earthen rampart 4 to 5 meters wide had been heaped, behind which ran a wall walk 2.80 to 3.50 meters wide.

The 1895 excavation found, beyond the mortared stone walls, remains of dry-stone masonry, indicating that the fort, like the nearby forts of Würzberg and Hesselbach, passed through all three building phases of the older Odenwaldlinie. It was first built in wood-and-earth construction around AD 100; in Hadrianic times, between 117 and 138, the wooden defenses were replaced by a double dry-stone wall filled with earth; and between 140 and 150 the dry-stone work was replaced by a mortared stone wall.

The fort bath

About 180 m northwest of the fort stood the fort bathhouse, already investigated by Knapp in 1806. It is a row-type bath (Reihentyp), with a long axis of 18.5 m including the praefurnium, or furnace room, and a maximum width of 11.13 m. Entry from the southeast led into a room that the excavator Friedrich Kofler interpreted as an apodyterium, or changing room, although by analogy with other military baths it probably functioned as a frigidarium, or cold room; the actual changing room was likely a wooden porch that the methods of the time could not detect. A cold-water basin stood in an annex to the left of this room, and a hypocausted annex with its own furnace to the right, interpreted as a sudatorium, or sweat room.

Research history and post-Roman use

The fort site remained known after the Roman period and was visible as a ruin. A 14th-century source, a document of 1432, calls it Bentzenburg, meaning "ghost castle" (Geisterburg). In the 18th century the Fürsten von Löwenstein-Wertheim-Rosenberg built a hunting lodge in the middle of the fort area, and the site remains a small building group in a forest clearing with a chapel, servants' house, inn, and forester's house. The investigations carried out in 1806 by Friedrich Knapp on behalf of Count Franz I. zu Erbach-Erbach neglected the fortifications themselves, on the assumption that the hunting lodge had already damaged them severely, and concentrated instead on the bathhouse.

The place name itself preserves the medieval perception of the ruins: according to the Südhessisches Flurnamenbuch, the name Hainhaus goes back to Middle High German hiune, "giant", the enormous stone remains having supplied the naming motive; the earlier name was Benzenburg.³ Local tradition likewise derives the name from the "Heunen" (giants) and the "Benzen" (ghosts).¹

The site today

The fort is recognizable on the ground only through terrain traces: the fort wall survives as a well-visible rampart, and the site is signposted with information panels.² Finds from the 1895 excavations, including wall tiles, floor slabs, and everyday objects, can be seen in the Odenwald-Museum in Michelstadt; the bathhouse is hardly findable today, overlaid by a forest path.⁴^•⁵ The ensemble also preserves later features: six baroque stone seats carved from monolithic sandstone blocks, two inscribed with the year 1775 for Carl, reigning Prince zu Löwenstein-Wertheim, and Josephine, Princess zu Löwenstein-Wertheim; an ice cellar on the west side of the fort; and a shaft well more than 40 m deep, dug in 1803, which supplied drinking water into the 1930s.⁶

As a Gesamtanlage, the site is entered in the monument list of the State of Hesse under § 2 paragraph 3 of the Hessian Monument Protection Act for historical reasons, and the fort and the adjoining Limes structures are protected Bodendenkmale under that law.¹ A visit is often combined with the reconstructed Limes watchtower Wp 10/15 "Im oberen Haspel" near Vielbrunn, a replica inaugurated in October 2010 to illustrate the function of the former frontier wall.²^•⁶

References

Topic: Encyclopedia › Places and geography › Parks, protected areas, and geographic heritage sites › Archaeological sites and site complexes › Greek, Roman, and Etruscan archaeological sites › Etruscan and pre-Roman Italian sites

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

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