So, a long time ago in London, there was a group of people who wanted to make money by trading goods with other countries. They called themselves the Company of Merchant Adventurers.
Now, the word "adventurer" here doesn't mean they went on big exciting trips, it just means they took some risks in business. They would buy goods like wool and then sell them to people in other countries for a higher price.
But they didn't do this on their own. They all worked together, kind of like a team. And they made some rules for themselves, like how much each person would invest in the business and how they would share the profits.
They also made sure to get permission from the king to do this trading, so they wouldn't get in trouble. And they even built a big house where they could all work and live together, called the Merchant Adventurers' Hall.
So, that's the Company of Merchant Adventurers of London. They were a group of people who wanted to make money by trading goods with other countries, and they worked together and made rules for themselves to be successful.