There's no single definitive answer to what the very first four-wheel drive vehicle was, as the development happened gradually with multiple inventors and designs. However,
Spicer's four-wheel drive system, used in a 1904 prototype, is often cited as one of the earliest successful implementations. While other earlier attempts existed, Spicer's system demonstrated practicality and influenced future developments.
It's important to note that the concept of four-wheel drive evolved over time, with earlier vehicles often employing rudimentary systems not as refined or reliable as later designs.
