A piece of gold coin current for 10b., in the reign of Henry VI., at which time there were half-rials and quarter-rials or rial-farthings. In the beginning of Queen Eliza-beth’s reign, golden rials were coined at 15s. a piece; and in the time of James I. there were rose-rials of gold at 30s. and spur-rials at 15s. Lown. Essay Coins, 38
Source: Black's Law Dictionary 2nd Ed (1910)
