There's no actual person that invented eating steak.
Although the concept of eating steak and steak cooking was developed in the 15th Century in Florence, Italy, with the dish bistecca alla fiorentina.
And English merchants also present at a St. Lawerence Day feast in Florence also likely anglicized the Italian word, which lead to the English term "beefsteak" and eventually the term "steak".
The word steak also comes from a 15th century Scandinavian word for a thick cut of meat.
And our ancestors have eaten sirloin steak before the Tuscans, steak as we know it today, is also said to have originated in 15th century Florence, the capital of Italy's Tuscany region.
Argentina is the country that eats the most steak as steak as they have a deeply ingrained cattle raising culture and traditional barbecue.
The United States also consumes more beef overall, due to it's large population, but Argentinians eat more beef per person, with consumption figures at around 100 lbs annually in recent years.
Steak is most commonly a slice of beef that is cut from the fleshy part of a carcass.
Although the term steak can refer to similar cuts of meat from other animals such as goat, bison, deer and even fish, but beef is the most common form of steak.
Beef steaks are also usually cut perpendicular to the muscle fibers and come from the tender areas of the animal, like the rib and loin to ensure that they are tender and suitable for fast cooking methods like grilling.