and Mostyn, the original name was wholly English but has gradually taken on a Welsh appearance. In some cases this in fact results from Welsh having preserved an earlier stage of English pronunciation; as is the case in Prestatyn (Old English Preostatun /'pre:əstɑtu:n/) or the mountain Cnicht ("knight"), Old/Middle English pronunciation /knɪɕt/. This also occurs in reverse; eg English Severn preserves the Proto-Celtic [s] which became [h] in modern Welsh (Hafren). In one or two others, such as Caergwrle, the name combines Welsh (caer) and English elements – the village was originally the English settlement of Corley. In some cases, the spelling formerly used in English has, over the past few decades, ceased to be accepted – examples are Caernarfon (formerly, in English, Ca(e)rnarvon), Conwy (formerly Conway), and Llanelli (formerly Llanelly). Most of these examples are in predominantly Welsh-speaking areas of Wales. There are also places where there are ongoing disagreements over whether the Welsh spelling should be used exclusively or not, such as Criccieth (Cricieth), Rhayader (Rhaeadr), and Ruthin (Rhuthun). In other cases, the Welsh and English names clearly share the same original form, but spellings and pronunciation have diverged over the years. One obvious example is Cardiff (Caerdydd). The medieval Welsh form was Caerdyf (with a final ) from which are derived the modern English Cardiff (with a final ) and the modern Welsh Caerdydd (with a final ). Some examples of the anglicisation of place-names are the towns of Denbigh and Tenby, both derived from the Welsh name Dinbych ("little fort"); Pembroke (from Penfro, literally "land's end"); Lampeter (from Llanbedr, in full Llanbedr Pont Steffan); Skenfrith (from Ynysgynwraidd); and Barmouth (in modern Welsh Y Bermo, but originally Aber-mawdd, meaning "mouth of the [river] Mawdd(ach))". Finally, there are a number of places, listed in the table below, where the English and Welsh names have, or may appear to have, different origins. These have developed for a variety of reasons. Brecon and Cardigan both took their English names from their surrounding historic kingdoms, but took their Welsh names from local rivers; almost the reverse process occurred at Usk. Names given by Norse settlers, such as Swansea, Fishguard and Anglesey, tended to be adopted in English usage but not by the Welsh. Again, there are exceptions such as the island of Skomer (from Norse words meaning "cloven island"). English names for the Great Orme and Worm's Head both derive from