Background: Gilbert and Sullivan refers to the Victorian-era theatrical partnership of the dramatist W. S. Gilbert (1836-1911) and the composer Arthur Sullivan (1842-1900) and to the works they jointly created. The two men collaborated on fourteen comic operas between 1871 and 1896, of which H.M.S. Pinafore, The Pirates of Penzance and The Mikado are among the best known. Gilbert, who wrote the libretti for these operas, created fanciful "topsy-turvy" worlds where each absurdity is taken to its logical conclusion--fairies rub elbows with British lords, flirting is a capital offence, gondoliers ascend to the monarchy, and pirates emerge as noblemen who have gone astray. Sullivan, six years Gilbert's junior, composed the music, contributing memorable melodies that could convey both humour and pathos.
Context: Gilbert was born in London on 18 November 1836. His father, William, was a naval surgeon who later wrote novels and short stories, some of which included illustrations by his son. In 1861, to supplement his income, the younger Gilbert began writing illustrated stories, poems and articles of his own, many of which would later be mined as inspiration for his plays and operas, particularly Gilbert's series of illustrated poems, the Bab Ballads.  In the Bab Ballads and his early plays, Gilbert developed a unique "topsy-turvy" style in which humour was derived by setting up a ridiculous premise and working out its logical consequences, however absurd. Director and playwright Mike Leigh described the "Gilbertian" style as follows:  With great fluidity and freedom, [Gilbert] continually challenges our natural expectations. First, within the framework of the story, he makes bizarre things happen, and turns the world on its head. Thus the Learned Judge marries the Plaintiff, the soldiers metamorphose into aesthetes, and so on, and nearly every opera is resolved by a deft moving of the goalposts... His genius is to fuse opposites with an imperceptible sleight of hand, to blend the surreal with the real, and the caricature with the natural. In other words, to tell a perfectly outrageous story in a completely deadpan way.  Gilbert developed his innovative theories on the art of stage direction, following theatrical reformer Tom Robertson. At the time Gilbert began writing, theatre in Britain was in disrepute. Gilbert helped to reform and elevate the respectability of the theatre, especially beginning with his six short family-friendly comic operas, or "entertainments", for Thomas German Reed.  At a rehearsal for one of these entertainments, Ages Ago, in 1870, the composer Frederic Clay introduced Gilbert to his friend, the young composer Arthur Sullivan. Over the next year, before the two first collaborated, Gilbert continued to write humorous verse, stories and plays, including the comic operas Our Island Home (1870) and A Sensation Novel (1871), and the blank verse comedies The Princess (1870), The Palace of Truth (1870) and Pygmalion and Galatea (1871).
Question: When was Gilbert born?. Whats the answer?
18 November 1836.