title: Thermostat
context: Possibly the earliest recorded examples of thermostat control were built by the Dutch innovator Cornelis Drebbel (1572–1633) around 1620 in England. He invented a mercury thermostat to regulate the temperature of a chicken incubator.[3] This is one of the first recorded feedback-controlled devices.
question: When were thermostats invented?
answers: Cornelis Drebbel