The sun is one of heraldry’s most radiant and ancient symbols, traditionally signifying glory, truth, authority, constancy, and life-giving power. In coats of arms, it may appear as a simple disk, a sun in splendour with rays, or a sun in his glory with a human face. Its light suggests knowledge, honour, divine favour, and the ability to illuminate darkness. Because the sun governs the day and nourishes the earth, it can also represent prosperity, renewal, leadership, and legitimate rule. Heraldic forms and terminology are explained in Parker’s Glossary of Heraldry and illustrated in examples from Heraldry of the World.

In medieval and Renaissance heraldry, the sun often carried religious and princely associations. It could suggest God’s grace, Christ as the light of the world, or a ruler whose justice shines over the realm. In dynastic heraldry, a rising sun may imply hope, new authority, or the beginning of a prosperous age, while a sun eclipsed or clouded can convey more complex meanings of struggle, change, or hidden power. The famous badge of Edward IV, the “Sun in Splendour,” became a major Yorkist symbol during the Wars of the Roses, linking the sun with victory, kingship, and political fortune.

Reliable heraldic examples include the Sun in Splendour badge of Edward IV, the arms of the City of Portsmouth, which feature a radiant star or sun-like device with a crescent, and many civic arms where suns denote enlightenment, climate, agriculture, or local identity. Modern national and municipal emblems also use the sun to express liberty, progress, and hope. As a charge, crest, or badge, the sun remains a brilliant heraldic image of splendour, vitality, wisdom, and sovereign power.