In 1605, Spanish explorer Álvaro Mexía visited while on a diplomatic mission to the local tribes living in the Indian River area. He called the local tribe of Ais people, part of the native province of Ulumay. Merritt Island is the prominent island on a color map he drew of the area, a copy of which is in the archives at the Library of Congress and the archives in Seville, Spain. Within a few years all but a handful of these natives were dead from illnesses unwittingly imported by the Europeans.