'Rumm' is the Rham plateau.
This plateau above Grund, enclosed by the Alzette on three sides, was used only by the military from the 14th century until the fortress was dismantled. The name 'Rhamen' appears in the mid-15th century.
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Sources
- Rumm-Befestegungen Wikipedia (Lëtzebuergesch)
- Clausen Wikipedia
This text was written with the help of AI from the sources above and checked against them.