|via my wife
The Manhattan was most certainly invented in New York, one of numerous cocktails named for the city's five boroughs. Accounts date its creation as far back as the 1860s. Several variations exist, some varying the base liquor, others switching to dry vermouth, still more toying around with different bitters. The most intriguing to me is the Fourth Regiment which includes dashes of orange, celery and Peychaud's bitters.