1. Mansa Musa, the ruler of the 14th century Mali Empire is one of the richest person to have ever lived (Inflation adjusted). When he made his pilgrimage to Mecca, he gave away so much gold that he completely devalued the metal in each city he passed through, disrupting economies and causing inflation in Cairo, Medina, and Mecca. 2. 02. In medieval England, children were beaten on the 28th of December (Holy Innocents Day” or “Childermass Day) to remind them of King Herod's cruelty.