Saint Patrick's Saltire or Saint Patrick's Cross is a red saltire (X-shaped cross) on a white field, used to represent the island of Ireland or Saint Patrick, the patron saint of Ireland. In heraldic language, it may be blazoned Argent, a saltire gules. Saint Patrick's Flag (Bratach Naomh Pádraig) is a flag composed of Saint Patrick's Saltire.
The red saltire's association with Saint Patrick dates from the 1780s, when the Order of Saint Patrick adopted it as an emblem. This was a British chivalric order established in 1783 by George III. It has been suggested that it derives from the arms of the...