Note 1 — Chapter I · CASTILE IN THE FIFTEENTH CENTURY
Reading edition
“The monetary unit of Castile was the ‘maravedi,’ anciently a gold coin of value; but, in the fifteenth century, diminished to a fraction of its former estimation.”—Lea, History of Spanish Inquisition, vol. i., Appendix III.
The ducat would be worth about 374 maravedis, or about 8s. 9d. in English money.