Who is Nathaniel Sweet from Lord Hornblower and what is their importance?

Nathaniel Sweet. officially the bosun's mate, is the ringleader of the mutiny aboard the Flame. Lord St. Vincent notes that Sweet is the only person with any record of prior trouble—having once been dismissed from service for drinking. Sweet's mark, or signature, along with Henry Wilson's and William Owen's, is one of the few named marks on the mutineer's written demands, though Lord St. Vincent comments that nearly the entire crew has made a mark upon the document.