At least 21 practice works were established south of the Castell Collen. This one is visible as crop marks.
http://roman-britain.co.uk/places/llandrindod.htm
http://www.coflein.gov.uk/en/site/308258/details/llandrindod-common-roman-camp-xi
Llandrindod Practice Camp XI
Nearby sites
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Llandrindod Practice Camp XX
Practice Camp
United Kingdom of Great Britain and Northern Ireland, Llandrindod Wells -
Llandrindod Practice Camp XII
Practice Camp
United Kingdom of Great Britain and Northern Ireland, Llandrindod Wells -
Llandrindod Practice Camp XIII
Practice Camp
United Kingdom of Great Britain and Northern Ireland, Llandrindod Wells -
Llandrindod Practice Camp IX
Practice Camp
United Kingdom of Great Britain and Northern Ireland, Llandrindod Wells