Llanfyllin is a small market town, community and also 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 suggests church or church (llan) of St Myllin ('m' often mutates to 'f' in Welsh). The community lies in the valley of the River Cain near the Berwyn Mountains in Montgomeryshire, 14 miles (23 kilometres) southwest of Oswestry as well as 15 miles (24 km) from Montgomery. The River Cain is signed up with by the small River Abel in Llanfyllin (presumably named after Cain as well as Abel in the Bible), and twists via the valley, moving into the River Vyrnwy at Llansantffraid. The community exists between Shrewsbury and Bala, for a very long time the essential market towns in this field of Wales and also the Welsh borders. At nearby Bodyddon there is proof of an early British settlement. Llanfyllin might be the "Mediolanum amongst the Ordovices" described in Ptolemy's Geography (c.? advertisement 150), although others argue for Meifod or Caersws. The community is known for its holy well, Fynnon Coed y Llan. The well is dedicated to Saint Myllin, that is deemed to have actually baptised individuals below in the 6th century. The parish church is likewise committed to Saint Myllin. There is a custom that Saint Myllin is the Irish bishop, Saint Mo Ling (additionally named Moling Luachra) (614-- 697). Nevertheless, this is uncertain. There is no record of Mo Ling taking a trip to Wales, as well as there is a tradition that Myllin is buried under the altar of Llanfyllin church whereas Mo Ling is believed to have been buried at his abbey in Ireland.