The triquetra knot motif is a triangular knotwork motif that can be found in many cultures in The World, and the name comes from the Latin tri “three” and quetrus “cornered”; it is also perhaps more widely known as a trefoil (three-leaf) or trinity knot. The design has many associations—mainly with religions—from the ancient Celts, Christianity, Paganism and even Norse mythology, bearing some similarity with Odin’s symbol, the valknut, and this simple motif can form the basis of many other designs too.
Drawing knotwork in Illustrator is made a lot easier using the Shape-Builder Tool, Shaper Tool and Live Paint toolset, as you only have to draw the path, then let the Appearance Panel and the shaping toolset do most of the work for you! Once you have learned the technique, you should find it relatively easy to replicate other knotwork designs and create your own.
Draw a Celtic Knotwork Motif in Illustrator
Make sure that you inspect the results because—as with any automatic functions—sometimes the odd glitch creeps in (almost exclusively down to the way the original paths were made) and you may need to clean up here and there. Fortunately Illustrator CC2015 allows you to zoom in to 64,000% so it’s a lot easier to inspect even tiny details. You may not have noticed in the video, but if you look closely towards the end you’ll see that a few fragments have crept in—but these were cleaned up in less than ten minutes with the Shape-Builder Tool (to merge areas) and the Pen Tool (to remove errant points).