Celtic Knots

Does anyone know of pattern sites that have celtic knot designs? I’m looking for the celtic love/wedding knot to knit into a blanket for my brother and his wife

thanks!

http://www.estelledesigns.ca/images/FreePaterns/CelticKnotSweater.htm

This sweater has a Celtic design on it, I’m not sure if it’s what you’re looking for.