John D. Rockefeller was a well-known man who created the Standard Oil Company and became a rich man due to oil. In 1911, the Standard Oil Company was the only company that sold oil and it became a monopoly. At this point, the highest court considered the way in which the Standard Oil Company was operating was illegal. During more modern times, many companies spawned from the Standard Oil Company including BP and Amoco.
However, they ended up merging or being bought out in order to operate on their own accord. Later Standard Oil changed and stopped being a company and ceased to exist. Now other companies that emerged from this Standard Oil Company have now been operating under different names.