This article is about the original B4297, now part of the A4067.
For the current B4297 north of Llanelli, see B4297
The former B4297 (now A4067
) in the hills
In 1922, the A4068 ran north to just outside Ystalyfera and stopped, splitting into the B4297 and B4298.
The B4297 ran through Ystalyfera, meeting the B4298 again, before continuing for some distance along the valley, eventually ending on the A40 at Sennybridge.
In 1935, the route through Ystalyfera between the two junctions with the B4298 was renumbered A4068; and the remainder to Sennybridge, A4067. Around Ystalyfera and Ystradgynlais much of the route has now been bypassed and the B4599 now follows much of the ex-B4297 in this area.