William Clapp was born in about 1500 in Sidbury, Devonshire, England. He married Alice ___ about 1526 in Sidbury. He wrote his will on 29 May 1555 as Yeoman of Harpford. His will was proved on 26 Jul 1555. He lists only one son Richard and five daughter: Florence Ybdon (and children of William Ybdon), Jyllyan Badstone, Alice Ynglande, Beaton and Johane the last two unmarried so possibly the youngest. And "Allse [Alice] my Wyffe."Wittness John Fulbrouke & T. Badstone. William's son Richard was progenitor of the New England family. Richard was married with two children at the time the will was written.
William Clapp was listed in the Devon subsidy rolls of 1523 through 1525 and from from 1541 through 1551,6 in the East Budleigh Hundred, parish of Sidbury. 
William passed away May 20, 1555 in Sidbury, Devon, England. He was buried in Saint Peter and Saint Giles Churchyard, Sidbury, Devon, England.
↑ Smith, Dean Crawford, and Melinde Lutz Sanborn. The Ancestry of Eva Belle Kempton 1878-1908. (Boston, Massachusetts: New England Historic Genealogical Society, 2000), Part IV: The Ancestry of Linda Anna Powers, 1839-1879 p 114-182
↑ Spear, Burton W. Search for the passengers of the Mary & John, 1630. (Toledo, Ohio: B.W. Spear, c1985-), Vol. 4. link
↑ Roberts, Gary Boyd. Ancestors of American Presidents. (Boston, Massachusetts: New England Historic Genealogical Society, 2009). , James A. Garfield, George H. W. Bush, George W. Bush and Franklin Delano Roosevelt; Roosevelt link