When was Magnate first discovered?

Magnate, a term commonly associated with a wealthy and influential person, does not refer to a specific discovery like a mineral or chemical element. However, if you meant "magnet," the phenomenon of magnetism has been known since ancient times, with lodestones being used as early as 600 BC. The scientific study of magnetism began to develop in the 17th century, notably with the work of William Gilbert in 1600. If you meant something else by "Magnate," please provide clarification.