On December 15, 1814, delegates from the five New England states (Maine was still part of Massachusetts at that time) gathered at the Hartford Convention to discuss New England's possible secession from the United States. During the early 19th century, the Hartford area was a center of abolitionist activity, and the most famous abolitionist family was the Beechers. The Reverend Lyman Beecher was an important Congregational minister known for his anti-slavery sermons. His daughter Harriet Beecher Stowe wrote "Uncle Tom's Cabin"; her brother Henry Ward Beecher was a noted clergyman who vehemently opposed slavery and supported the temperance movement and women's suffrage. The Stowes' sister Isabella Beecher Hooker was a leading member of the women's rights movement.