
Celtic knots and stylized are a variety of (mostly endless) knots graphical decoration,
adopted by the ancient Celts.
Though Celtic knots were being created in Polytheistic Celt times, these knots are most known for their adaptation for use in
the ornamentation
of Christian monuments
and manuscripts
like the 8th century Book of Kells.
History
Not much history of the knots is available before the
beginning of the Christian influence on the Celts in about A.D. 450. There is much
evidence for the use of geometric patterns as ornamentation,
particularly in jewelry before that time. Some historians have theorized that
early Celtic religion prevented their depicting creatures realistically.

The same
pre-Christian designs found their way into early Christian
manuscripts and artwork with the addition of depictions from life, such as animals, plants and even humans. In the
beginning the patterns
were intricately interwoven cords, called plaits, which can
also be found in other areas of Europe, like Italy in 6th century. A fragment
of a Gospel Book, now in the Durham Cathederal library and created in northern Britain in
the 7th century,
contains the earliest example of true knotted designs in the Celtic manner.
Examples of plaitwork (a woven, unbroken cord design) predate knotwork designs
in several cultures around the world, but the broken and
reconnected plait work that is characteristic of true knotwork began in
Northern Ital and Southern Gaul and spread to Ireland by the 7th
century. The style is most commonly
associated with the Celtic lands but it was also practiced extensively in
England and was exported to Europe by Irish and Northumbrian monastic
activities on the continent. In modern
times, Celtic Art is popularly thought of in terms of national identity and
therefore specifically Irish, Scottish or Welsh.
J. Romilly Allen has identified “eight elementary knots which for
the basis of nearly all the interlaced patterns in Celtic decorative art”;
however, there is no evidence to indicate that a knot had any specific
philosophical or religious significance.
Some Wiccans have taken up the creation of Celtic knots, attributing to
them ideas and magical properties that may not have been there originally.
Many items decorated with knotwork have been found in
archeological sites. Items such as
torcs, bowls and cups are adorned with intricate patterns by ancient
smiths. Significance beyond perhaps the
most obvious, that being the intricacy capable in the work of humans, itself
reflective of the intricacy of Natural forms.

This is an example of a modern stylization.