William Williams of Pembroke, Bermuda was the husband of Sarah Martha Dunscombe (d.1876 Pitts Bay, Bermuda). She was the dau of Edward & Christian Godfrey Dunscombe. William Williams is mentioned in the wills of Christian Godfrey Dunscombe and William Dunscombe (bro of Edward).
William Dunscombe and Sam Williams were among the "loyal ten" who protested in 1786 the neglect of the investigation into the powder theft. [in 1775 and group of Bermudians stole the island's powder and gave it to the American rebels] The committe investigating this theft (in 1786) were told by Ben Williams (related?)who was a justice of Devonshire that his wife's father, Joseph Jennings, had been asked by one of the suspected powder theives (James Tucker) to borrow a boat to aid in the robbery.
Info in the above paragraph is from Bermuda and the American Revolution: 1760-1783 by Wilfred Benton Kerr (pub.1960) which I recently borrowed via ILL.