This good led Hadrian to change the official symbol of Hispania to reflect its production along the Ebro River. The trade in 
This good led Hadrian to change the official symbol of Hispania to reflect its production along the Ebro River. The trade in this substance resulted in a pile of broken containers a hundred meters high at Monte Testaccio in Rome. An ancient-world tool called the strigil was used to remove this substance. The winner of the Panatheneaic Games obtained a lot of this substance as a reward, and a machine to create it in Miletus made the poor philosopher Thales rich. This good, a product of a gift from Athena, was, like wine, extracted at villas with screw-presses and stored in amphorae. For 10 points, name this liquid used in classical antiquity for washing and lighting, a plant product later used for seasoning food.
This good led Hadrian to change the official symbol of Hispania to reflect its production along the Ebro River.
olive oil [prompt on oil; prompt on olive branch]