The Bertradaburg is a ruined hill castle on a rock spur above the village of Mürlenbach in the county of Vulkaneifel. The castle was built on the remains of a Roman castrum, which probably guarded the Roman road from Trier to Cologne. In the castle, according to local tradition, Bertrada, the mother of Charlemagne is said to have lived which implies that his birth was around 747 AD. The existence of the castle is first recorded in the 13th century when it is mentioned as a state fortress of the princely imperial abbey of Prüm (c.f. the Middle Rhine Register or Mittelrheinisches Urkundenbuch), archaeological finds have indicated that there were earlier fortifications on the site.
After Prüm Abbey was occupied and damaged by French Revolutionary troops from 1794 to 1802, Mürlenbach's castle was seized as part of the forced secularisation of the abbey estate and auctioned by France to a private owner.
In the late 20th century, the surviving castle walls and buildings were restored by the Tiepelmann family and the state-owned, 30-metre-high, ruined double tower gate was rebuilt with state finance. In 2009, the nine owners were given a grant from the federal and state budgets to secure and maintain the 16th-century, five-metre-thick, southwest roundel. The 13th-century shield wall was also renovated with funding from the state of Rhineland-Palatinate.
The 30-metre-high tower house, the double tower gateway of the Betradaburg, is visible from a long way off. It has good views of the surrounding countryside and may be visited as part of a guided tour. Every year the Mürlenbach Castle Festival (Mürlenbacher Burgfest) takes place. The castle is privately owned and has holiday apartments which are currently being renovated.
References:The Villa d'Este is a 16th-century villa in Tivoli, near Rome, famous for its terraced hillside Italian Renaissance garden and especially for its profusion of fountains: the extraordinary system contains fifty-one fountains and nymphaeums, 398 spouts, 364 water jets, 64 waterfalls, and 220 basins, fed by 875 meters of canals, channels and cascades, and all working entirely by the force of gravity, without pumps. It is now an Italian state museum, and is listed as a UNESCO world heritage site.
Tivoli had been a popular summer residence since ancient Roman times due to its altitude, cooler temperatures and its proximity to the Villa Hadriana, the summer residence of the Emperor Hadrian I.
The Villa was commissioned by Cardinal Ippolito II d'Este (1509-1572), second son of Alfonso I d'Este, the Duke of Ferrara and grandson of Pope Alexander VI, along with Lucrezia Borgia.