kilometers north–south, and 80 north-west. The area around Fritzlar shows evidence of significant pagan belief from the 1st century on. Geismar was a particular focus of such activity; it was continuously occupied from the Roman period on, with a settlement from the Roman period, which itself had a predecessor from the 5th century BC. Excavations have produced a horse burial and bronze artifacts. A possible religious cult may have centered on a natural spring in Geismar, called Heilgenbron; the name "Geismar" (possibly "energetic pool") itself may be derived from that spring. The village of , now a part of Gudensberg near Fritzlar and less than ten miles from Geismar, was likely an ancient religious center; the basaltic outcrop of Gudensberg is named after Wodan, and a two-meter tall quartzite megalith called the Wotanstein is at the center of the village. By the mid-7th century, the Franks had established themselves as overlords, which is suggested by archeological evidence of burials, and they built fortifications in various places, including Christenberg. By 690, they took direct control over Hessia, apparently to counteract expansion by the Saxons, who built fortifications in Gaulskopf and Eresburg across the river Diemel, the northern boundary of Hessia. The Büraburg (which already had a Frankish settlement in the sixth century) was one of the places the Franks fortified to resist the Saxon pressure, and according to John-Henry Clay, the Büraburg was "probably the largest man-made construction seen in Hessia for at least seven hundred years". Walls and trenches totaling one kilometer in length were made, and they enclosed "8 hectares of a spur that offered a commanding view over Fritzlar and the densely-populated heart of Hessia". Following Saxon incursions into Chattish territory in the 7th century, two gaue had been established; a Frankish one, comprising an area around Fritzlar and Kassel, and a Saxonian one. In the 9th century, the Saxon Hessengau also came under the rule of the Franconians. Holy Roman Empire From 962 the land which would become Hesse was part of the Holy Roman Empire. In the 10th and 11th centuries it was mostly encompassed by the Western or Rhenish part of the stem duchy of Franconia. In the 12th century, Hessengau passed to the Landgraviate of Thuringia. As a result of the War of the Thuringian Succession (1247–1264) the former Thuringian lands were partitioned between the Wettin Margraviate of Meissen, which gained Thuringia proper, and