Llanfyllin is a little market community, community as well as selecting ward in a sparsely-populated area 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' often alters to 'f' in Welsh). The community hinges on the valley of the River Cain near the Berwyn Mountains in Montgomeryshire, 14 miles (23 kilometres) southwest of Oswestry and 15 miles (24 km) from Montgomery. The River Cain is signed up with by the small River Abel in Llanfyllin (probably called after Cain and Abel in the Bible), and also twists with the valley, flowing into the River Vyrnwy at Llansantffraid. The community exists in between Shrewsbury and also Bala, for a long period of time the key market communities in this field of Wales and also the Welsh borders. At neighboring Bodyddon there is evidence of a very early British settlement. Llanfyllin may be the "Mediolanum among the Ordovices" described in Ptolemy's Geography (c.? advertisement 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 baptised people below in the 6th century. The parish church is also committed to Saint Myllin. There is a tradition that Saint Myllin is the Irish diocesan, Saint Mo Ling (additionally called Moling Luachra) (614-- 697). Nevertheless, this is uncertain. There is no document of Mo Ling taking a trip to Wales, and there is a custom that Myllin is hidden under the altar of Llanfyllin church whereas Mo Ling is thought to have actually been buried at his monastery in Ireland.