W.S. Gilbert (1836-1911) was an English poet, playwright, librettist and illustrator best known for the comic operas he produced in collaboration with the composer Arthur Sullivan - including theatre perennials such as The Mikado, The Pirates of Penzance and HMS Pinafore.
[Gilbert's] lyrical facility and his mastery of metre raised the poetical quality of comic opera to a position that it had never reached before and has not reached since. * The Cambridge History of English and American Literature *