Somerville is Sumarez in the 1746 original and his ship is indeed The Nottingham. You'll probably pick all this up in Tim's links. I'm sure there's another thread revealing all this somewhere. Phil Sumarez wrote the original ballad himself which later morphed into 'The Dolphin, Lion Man of War, Warlike Seamen, The Wasp and a host of other imitations. There was a TV programme on him about 6 months ago.