“He was a bold man who first ate an oyster,” observed Jonathan Swift; and in fact the first human interaction with the Atlantic Ocean was probably eating shellfish, traces of which can be found along the Western Cape of South Africa dating back 160,000 years ago. When humans began to finally live in numbers along the ocean coast, their culture changed. They took their food from it, and from the shoreline, and their metals from the rocks and marshes along its coast. In time they built boats capable of venturing along those coasts, and then gradually farther and farther out. All of this, my guest John Haywood argues, was foundational for what was to come. He writes:  The history of the pre-Columbian Atlantic is…the where and when that Europeans served their apprenticeships in ocean navigation, commerce and colonialism, and that saw them formulate the ideologies they used to justify their territorial claims and their exploitation of colonized peoples. When Europeans finally broke out onto the world’s oceans in the sixteenth century, they already had everything they needed to secure global domination. John Haywood is a historian of the Vikings, and of the early maritime history of the North Atlantic. The author of numerous books, his latest is Ocean: A History of the Atlantic before Columbus.