From Ohio History Central
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<p>The Piankashaw (or Piankeshaw) were members of the Miami nation, although they lived apart from the Miami -- in far Western Ohio, and, by the 18th century, in the territory now comprising Indiana and Illinois. The United States referred to the Piankashaws as a separate tribe in the Treaty of Greeneville. The Piankashaw, like the Miami, spoke an Algonquian language.
<p> In the late 1700s and the early 1800s, the Piankashaw and the Wea worked closely together, oftentimes sharing the same villages. The Piankashaw did not play a major role in Ohio during the 1700s and the 1800s, but they were signatories for many treaties involving American Indian lands in the Ohio Territory. As tensions with encroaching Anglo-American settlers increased, many Piankashaw moved from their 18th-century home base in today's Vincennes, Indiana to Kaskaskia Illinois, or to Terre Haute -- strongholds for the Kaskaskia and Wea nations. By the early 19th century, the Piankashaws forfeited all claims to the land in what is now Ohio.</p><p> The Piankashaw, Kaskaskia and Wea nations are federally recognized as the combined Peoria Tribe of Oklahoma.</p>