The rial was an old English gold coin of varying value. In the reign of Henry VI the rial was worth 10s; at the beginning of the reign of Elizabeth I rials were current at 15s and in the reign of James I the rose-rial was current at 30s and the spur-rial at 15s. The rial is the currency of Iran, Oman and Saudi Arabia. Research Rial
The spur-rial was a gold coin first struck in the reign of Edward IV, and so named on account of having on its reverse a sun with four cardinal rays issuing from it. In the reign of James I its value was 15s. Research Spur-Rial
 
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