Jacob Williams & Joanna Dean Williams and their Descendants, Volume II - The Fourth Generation" is the second book in a series documenting their extensive Williams family originating from what is now known as Somerset County, Maine. It was there that Jacob and Joanna planted their family roots next to the Kennebec river in the wilderness of Maine where in 1781 they moved with their young son Caleb from Barnstable County, Massachusetts. The fourth generation of Jacob & Joanna Dean's large extended family was made up of their 366 great-grandchildren. This book richly documents the lives of 280 of those great-grandchildren with a biographical sketch for each individual containing historic facts and photographs gathered from family collections, government records and various historical resources. The other 86 great-grandchildren were previously documented in the first book of this series, "Jacob Williams & Joanna Dean Williams and their Descendants, Volume I - The First Three Generations". Those individuals had either died in their youth, died as unmarried young adults without issue, or sufficient information about their life and death could not be found to support writing a future biographical sketch.Besides Williams, the prominent surnames of the great-grandchildren of Jacob and Joanna include Atwood, Berry, Eames, Foss, Houghton, Moulton, Padham, Taylor and Witham, just to name a few.