THE LIFE OF A PROFESSIONAL MERMAID 'Real' mermaids? The reality of mermaids was assumed during medieval times, when they were depicted matter-of-factly alongside known aquatic animals such as whales. Hundreds of years ago sailors and residents in coastal towns around the world told of encountering the sea maidens. One story dating back to the 1600s claimed that a mermaid had entered Holland through a dike, and was injured in the process. She was taken to a nearby lake and soon nursed back to health. She eventually became a productive citizen, learning to speak Dutch, perform household chores, and eventually converted to Catholicism.