Three early trading cultures along the medaterian sea were

Most often you could find the answer to be the people from Crete, the people from Byblos, and the people from Ugarit. However, it's important to note that we have to know a time period that we're looking at, as in the early days of human civilization, a lot of cultures came and went, where many of them were similar to each other.

Crete, byblos, ugarin crete ... theres many more too : D