The 1841 United States Exploring Expedition, led by Charles Wilkes of the U.S. Navy, named it the Great Peninsula or Indian Peninsula. While "Great Peninsula" remains the official name,[1] the name "Kitsap Peninsula" is more commonly used and is derived from Kitsap County, which occupies most of the peninsula. The county was named for Chief Kitsap, a late 18th- and 19th-century warrior and medicine man of the Suquamish Tribe.[2] The Suquamish were one of the historical fishing tribes belonging to the Coast Salish peoples, and their ancestral grounds were based on the eastern shores of the Kitsap Peninsula. The city of Seattle is named after the tribe's most famous leader, Chief Seattle.