SARN-SWS WAY, or Sarn-Susan Way, a Romanroad in Wales; supposed to have run from Brecon, by Custeth-Collen to Caersws on the river Severn, in Llan-wnog parish, Montgomeryshire; but traced only from Caersws, past Gwynfynydd camp, Meifod on the river Einion, Lyssin on the river Vyrnwy, Street-fawr at Clawd-Coch on the river Tanat, Rhos-y-brith-dir, Pen-y-Street, and Lanywrch, to Caer-fach camp; and supposed to have probably gone thence to Chester.

(John Marius Wilson, Imperial Gazetteer of England and Wales (1870-72))