I have used this term Gresham's Law here many times. But not properly.
There is such economic treatise named: "De monetae cudendae ratione" (LINK)
It contained especially the explanation of a basic economic principle, that of two currencies with equal legal tender existing in the same country, the bad one forces out of circulation the good one. By some scientific misunderstanding this principle was attributed to Thomas Gresham.
The famuos polish astronomer Nicholas Copernicus wrote his Law in 1526, when Thomas Gresham was 14 years old kid... :)