oak [OE
āc]. The mighty deciduous hardwood (genus
Quercus) has played a prominent role in the Celtic imagination from ancient to modern times. The English word ‘druid’ (from the Latin plural druidae) derives in part from the root dru- [oak]; Celtic words for oak, e.g. OIr. and ModIr. dair, W derwen, share the same root. The ancient geographer
Strabo (1st cent. AD) reported that the important sacred grove and meeting-place of the
Galatian Celts of Asia Minor,
Drunemeton, was filled with oaks. In an often-cited passage from
Historia Naturalis (1st cent. AD),
Pliny the Elder describes a festival on the sixth day of the moon where the druids climbed an oak tree, cut a bough of mistletoe, and sacrificed two white
bulls as part of a fertility rite. Elsewhere druids made their wands from only three woods:
yew, oak, and
apple. In Mediterranean culture the oak was sacred to both Zeus and
Jupiter, some aspects of which were no doubt transferred to the worship of Gaulish Jupiter. Britons under Roman occupation worshipped a goddess of the oak tree,
Daron, whose name is commemorated in a rivulet in
Gwynedd. According to the pseudo-history
Lebor Gabála [Book of Invasions], the sacred oak of early Ireland was that of Mugna, probably located at or near Dunmanogoe, south Co. Kildare. Sacred associations of oaks survived Christianization, so that St
Brigit's monastic foundation was at Cill Dara [church of (the) oak, i.e. Kildare], and St
Colum Cille favoured Doire Calgaich [Calgach's oak grove, i.e. (London-)Derry]; see also
DURROW [
darú, from
dair magh, oak plain]. In Welsh tradition
Gwydion and
Math use the flower of oak with broom to fashion the beautiful
Blodeuwedd. When
Lleu Llaw Gyffes is about to be killed by
Gronw Pebyr, his wife's lover, he escapes in
eagle form onto a magic oak tree. A sacred oak tree protects the Breton city of
Ys until the feckless boy
Kristof removes it, allowing Ys tobe engulfed. The Arthurian figure
Merlin is imprisoned in an oak tree in the Breton forest of
Brocéliande by Viviane/Nimiane (the Lady of the Lake). In both British and Irish fairy lore, the oak is one of three magical woods, along with
ash and thorn. OIr. and ModIr. dair; ScG darach; Manx daragh; W derwen, dâr; Corn. derowen; Bret. dervenn.