Edward Somerset Worcester, second marquis of, an English inventor, born about 1C01, died April 3, 1667. With his father, the first marquis, he zealously maintained the royal cause during the civil wars, and Raglan castle, the family seat, was one of the last places that held out against the parliamentary forces. He invented and constructed the first actual steam engine, a description of which is given in his "Century of the Names and Scantlings of such Inventions as at present I can call to mind to have Tried and Perfected" (1663; reprinted in Dircks's "Life, Times, and Scientific Labours of the Second Marquis of Worcester," London, 1865). He described his invention also in "An Exact and True Definition of the most Stupendous Water-Commanding Engine, invented by the Right Honorable (and deservedly to be praised and admired) Edward Somerset, Lord Marquis of Worcester." (See Steam Engine, vol. xv., p. 339.) He was looked upon by his contemporaries as a visionary speculator.