A super write up on horses by Mary Mycio (HT: thebrowser.com).
The association between horses and wealth was forged millennia ago. In fact, the first people known to celebrate hierarchies of power, whose inequalities of wealth were integral to their society and culture—the people you could call the first 1 percent—were the first people to ride horses.
Horse domestication occurred before written history and left few clear archaeological remains. Based on Sumerian seals with the earliest known depictions of people on horseback, riding has traditionally been dated to the Bronze Age, around 2000 B.C., in Mesopotamia.
Read the piece for further details..