Cadair Idris

means 'Idris's Chair'. Idris is usually taken to be the name of a giant or, alternatively, it may refer to (or ), a 7th-century prince of Meirionnydd who won a battle against the Irish on the mountain. was in fact referred to as ('Idris the Giant') in some mediaeval genealogies of Meirionydd. It appears that is the form used in the earliest Welsh-language sources. In a poem in his own hand in the second half of the 15th century, the poet wrote "" ('and then over Cadair Idris'). Around 1600, John Jones of Gellilyfdy referred to "" ('the mountain, peak or hill known as Cadeir Idris'). The spoken form represented by had developed by the end of the Middle Ages and as a result the form was often used in English and Latin documents at that time and in more recent documents in English and Welsh. In his published in 1632, John Davies of differentiated between the two words ('chair') and ('fort, fortress'), referring to and . That interpretation was followed by some later lexicographers, including Thomas Charles and Titus Lewis. It is now accepted, however, that is a spelling of a spoken form of , and that there is no evidence that and are separate words. But as it represents the pronunciation in the local dialect, the spelling is often seen in Welsh and English, and in June 2016 Snowdonia National Park decided to adopt that spelling on its signage, despite advice from the Welsh Language Commissioner and from Park officers, who favoured . The local dialect form is also seen in the name of the local secondary school, Ysgol y Gader. The name of the mountain is typically spelt ' on current maps. The summit of the mountain is known as ('top of the chair/stronghold'). ==Ascent==

There are three main trails that lead to the top of Cadair Idris. The summit, which is covered in scree, is marked by a trig point. There is also a low-standing stone shelter with a roof. Pony Path The Pony Path (Welsh: Llwybr Pilin Pwn), which begins in the north from either Dolgellau or the Mawddach estuary, is the easiest but the longest of the main trails. Its length from the mountain's base is with a climb. Fox's Path The '''Fox's Path' (Welsh: Llwybr Madyn''), is the most direct way to the summit as the trail leads straight up the northern face. The ascent involves a climb up a cliff-scree face. However, this part of the Fox's Path has been heavily eroded in recent years making the descent dangerous. Minffordd Path The Minffordd Path (Welsh: Llwybr Minffordd) starts on the southern side of the mountain near the glacial Tal-y-llyn Lake. Hikers using this ascent climb past Llyn Cau and along the rim of Craig Cau (rockwall) to Penygadair. Its length is and involves two climbs of over . ==Geology==

Cadair Idris is formed from a complexly fractured and folded pile of both sedimentary rocks and igneous rocks of Ordovician age. They comprise the mudstones and siltstones of the Ceiswyn Formation which form much of the southern part of the mountain, together with the varied rocks of the underlying Aran Volcanic Group. The steep cliffs rising above Llyn Cau to the north are formed from hard-wearing basalts and tuffs of the Pen y Gadair Volcanic Formation whilst those on the south side are acid tuffs of the Craig Cau Formation. The imposing cliffs which characterise the north side of the mountain are formed from a microgranite intruded into the Ty'r Gawen mudstones. In common with the rest of Snowdonia, the faulting and folding of this rock succession took place during the Caledonian Orogeny. '' by Richard Wilson, 1774 The crater-like shape of Cwm Cau has given rise to the occasional mistaken claim that Cadair Idris is an extinct volcano (though as noted above, some of its bedrock is volcanic in origin). This theory was discounted as early as 1872, when Charles Kingsley commented in his book Town Geology: The natural bowl-shaped depression to which the name of chair has been attached, was formed by a cirque glacier during multiple ice ages when snow and ice accumulated on these slopes partly through avalanching. The glacier was up to a square kilometre in size surrounded on three sides by steep cliffs the highest being the headwall. The chair of Cadair Idris is this bowl-shaped hollow in the bedrock formed by the movement of glacial ice across the floor of the hollow, abrading it and the lip over which it then flowed. near Llyn Cau. The direction of the glacial movement was from left to right. There are several tear-drop shaped knolls above the edge of Llyn Cau, each of which is a roche moutonnée formed by the abrasive action of the moving ice. The two highest lakes are Llyn Cau and Llyn y Gader; the latter is thought to have a maximum depth of about . Much of the area around Cadair Idris was designated a National Nature Reserve in 1957, and is home to Arctic–alpine plants such as purple saxifrage and dwarf willow. ==Myths, legends and popular culture==

route of the Fox's Path is highlighted in sunlight (centre). There are numerous legends about Cadair Idris. Some nearby lakes are supposed to be bottomless, and anyone who sleeps on its slopes alone will supposedly awaken either a madman or a poet. This tradition (of sleeping on the summit of the mountain) apparently stems from bardic traditions, where bards would sleep on the mountain in hope of inspiration. Although the mountain's name is typically taken to refer to the mythological giant Idris, who was said to have been skilled in poetry, astronomy and philosophy, an idea used by author Susan Cooper in her book The Grey King. However, this translation is mistaken and there is no etymological or traditional connection between Idris and Arthur. In Welsh mythology, Cadair Idris is also said to be one of the hunting grounds of Gwyn ap Nudd and his Cŵn Annwn. The howling of these huge dogs foretold death to anyone who heard them, the pack sweeping up that person's soul and herding it into the underworld. Similarly the Brenin Llwyd is also said to haunt a number of locations including Cadair Idris. The mountain is mentioned several times and is used as a backdrop to the story of Mary Jones and her Bible. This story is an account of a girl from Llanfihangel-y-Pennant at the foot of the mountain who walked 25 miles to Bala in order to buy a bible, which were scarce at the time. Jones' determined journey to get hold of a copy of the book in 1800 was a major factor behind the foundation of the British and Foreign Bible Society in 1804. "Tongues of fire on Idris flaring" is mentioned in the opening verse of the John Guard version of the song "Men of Harlech". In Cassandra Clare's Clockwork Princess Idris is where final battle between the protagonists and antagonist takes place. ==References==