Llanfyllin is a little market town, neighborhood and selecting ward in a sparsely-populated location in Montgomeryshire, Powys, Wales. Llanfyllin's population in 2011 was 1,532, of whom 34.1% could talk Welsh. Llanfyllin implies church or church (llan) of St Myllin ('m' regularly mutates to 'f' in Welsh). The town depends on the valley of the River Cain near the Berwyn Mountains in Montgomeryshire, 14 miles (23 km) southwest of Oswestry and also 15 miles (24 km) from Montgomery. The River Cain is joined by the little River Abel in Llanfyllin (probably named after Cain as well as Abel in the Bible), and also twists through the valley, moving right into the River Vyrnwy at Llansantffraid. The community lies between Shrewsbury and also Bala, for a very long time the essential market towns around of Wales and also the Welsh borders. At nearby Bodyddon there is evidence of an early British settlement. Llanfyllin might be the "Mediolanum among the Ordovices" defined in Ptolemy's Location (c.? ad 150), although others argue for Meifod or Caersws. The town is understood for its divine well, Fynnon Coed y Llan. The well is committed to Saint Myllin, who is deemed to have actually baptised individuals below in the 6th century. The parish church is likewise devoted to Saint Myllin. There is a practice that Saint Myllin is the Irish diocesan, Saint Mo Ling (likewise named Moling Luachra) (614-- 697). Nonetheless, this is uncertain. There is no record of Mo Ling taking a trip to Wales, and there is a tradition that Myllin is buried under the altar of Llanfyllin church whereas Mo Ling is thought to have been buried at his abbey in Ireland.