The first mention of a coffee brewing tool called the "French Press" dates back to 1852, when two Frenchmen, Mayer and Delforge, introduced the world to a coffee machine with a sieve attached to a rod. The first patent was obtained in 1928 in Italy by the inventors Attilio Calimani and Guilio Moneta.
In Australia and New Zealand, the French press is known as the coffee plunger, in Europe - the cafetiere ("coffee machine"), and in North America - the coffee press.
To brew coffee in a French press, you should adhere to the following recipe: very coarse coffee (visually - like coarse sea salt) in a ratio of 1:16 to water. Which means: 1 gram of coffee needs about 16 grams of water. So for a 350 ml French press you will need 21 grams of coffee, and for 800 ml - about 45 grams.
Focus on your taste, experiment!