What is "spur-royal"

Spur-royal \Spur"-roy`al\ (sp[^u]r"roi`al), n. A gold coin, first made in the reign of Edward IV., having a star on the reverse resembling the rowel of a spur. In the reigns of Elizabeth and of James I., its value was fifteen shillings. [Written also spur-rial, and spur-ryal.]

alt. A former gold coin, first made in the reign of (w: Edward IV), having a star on the reverse resembling the rowel of a spur. n. A former gold coin, first made in the reign of (w: Edward IV), having a star on the reverse resembling the rowel of a spur.