When was the Ambulance first invented?

Transporting patients by cart has been around since the ancient times. The Spanish in 1487 used them most regularly for emergency transport in the form of carts/carriages/wagons and the Knights of St. John. Thereafter throughout American and European countries during times of civil war and unrest. During the 19th - 20th centuries motor technology lent itself to advancement providing for motorized ambulances. Sometimes Hearses were also used as ambulances. Over many decades evolving into what it is today. In the 1980's ambulances had a fuel overhall changing from gas to diesel.