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In page Pequots:

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The smallpox epidemic of 1616–1619 killed many of the Indians of the eastern coast of New England, but it failed to reach the Pequot, Niantic, and Narragansett tribes. In 1633, the Dutch established a trading post called the House of Good Hope at Hartford. They executed the principal Pequot sachem Tatobem because of a violation of an agreement. After the Pequots paid the Dutch a large ransom, they returned Tatobem's body. His successor was Sassacus. In 1633, an epidemic devastated all of the region's tribes, and historians estimate that the Pequots suffered the loss of 80 percent of their population. At the outbreak of the Pequot War, Pequot survivors may have numbered only about 3,000.[6]