A common “Sea Beast” in many Kingdoms Heraldry, The Sea Horse is an ancient symbol which predates The Middle Ages by Centuries. In Heraldry terms, it is portrayed as Half-Horse and Half-Fish. They were commonly used as Supports of Arms. A history of “Sea Service” was not always necessary for conferment. They were used to convey “Steadfastness”, “Strength” and “Vigilance”.