Keats House is a museum in a house once occupied by the Romantic poet John Keats. It is in Keats Grove, Hampstead, north London. Maps prior to ca.1915 show the road with one of its earlier names, John Street; the road has also been known as Albion Grove. The building was originally a pair of semi-detached houses known as "Wentworth Place". John Keats lodged in one of them with his friend Charles Brown from December 1818 to September 1820. These were perhaps Keats's most productive years. According to Brown, "Ode to a Nightingale" was written under a plum tree in the garden.