On October 12, 929, roughly 1100 years ago, Abd-ar Rahman III of the Umayyad Dynasty was proclaimed ruler of Cordoba– the Islamic kingdom that comprised most of Spain at the time.
Rahman was just 21 when he ascended to power, and he remained there for nearly 50 years as one of the wealthiest and most powerful monarchs in Europe.
Historians Denis Cardonne and Edward Gibbon calculate his annual tax revenue at approximately 12 million gold dinars… which was a LOT.
The dinar contained 4.25 grams of gold, so 12 million of them would be worth about $2 billion today.
With Cordoba’s population estimated at around 500,000 people back in the early 10th century, that works out to be the modern day equivalent of $4,000 in tax per person.