Celtic knots are stylized representations of the knots that were used for the decoration of Christian monuments and ancient documents. They have been found in Roman mosaics from the 4th century A.D. and the design has been filled with significance from then on. These patterns are believed to represent faith and unity between people, but also it is believed that they provide protection against evil spirits. With so much history, it’s no wonder they have become an integral part of Celtic jewelry design.