The below text has been taken from Wikipedia: https://en.wikipedia.org/wiki/Saint_Illtyd%27s_Walk
1. The walk was mapped out (over pre-existing footpaths) in 1994, to celebrate the 10th anniversary of the Llanelli Ramblers. Colin Davies, who devised the route, authored a guidebook the same year detailing the walk.
2. The route skirts the fringes of Burry Port, heading east to the Lliedi reservoirs then to Pontarddulais. It then turns northeast heading up via Graig Fawr onto Mynydd y Gwair then heads southeast via Bryn Mawr and Mynydd Carnllechart to the Swansea Canal north of Pontardawe following the towpath past Ynysmeudwy and Cilmaengwyn. The route then climbs east over the northern end of the Mynydd Marchywel ridge and down to cross the River Dulais at Crynant. From there it climbs steeply up through forestry to Sarn Helen which here runs along Hirfynydd and then steeply down to Resolven in the Vale of Neath. Passing Melincourt Falls it climbs again to Cefnmawr and then turns southbound for Cwm Afan. From there it runs through Afan Forest Park to the village of Bryn thence through more forestry via Mynydd Bach before dropping down to Mynydd y Castell and Margam Country Park.
3. Saint Illtyd was a well respected 7th century saint, the trail follows a route that St Illtyd is believed to have travelled whilst preaching in South Wales. The trail links with other long distance routes in south Wales including the Coed Morgannwg Way, Wales Coastal Path and the Ogwr Ridgeway Walk. St Illtyd lived in the latter part of the 5th and early part of the 6th century. He was held in high veneration in Wales being the founder and abbot of Llanilltud Fawr (Llantwit Major) in the Vale of Glamorgan.
