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Although binary systems with a white dwarf are expected to be overabundant in globular clusters compared with in the Galaxy, only two novae from Galactic globular clusters have been observed. We present the discovery of an emission nebula in the Galactic globular cluster M 22 (NGC 6656) in observations made with the integral-field spectrograph MUSE. We extracted the spectrum of the nebula and used the radial velocity determined from the emission lines to confirm that the nebula is part of NGC 6656. Emission-line ratios were used to determine the electron temperature and density. It is estimated to have a mass of 1\u201317\u2005\u00d7\u200510<jats:sup>\u22125<\/jats:sup><jats:italic>M<\/jats:italic><jats:sub>\u2299<\/jats:sub>. This mass and the emission-line ratios indicate that the nebula is a nova remnant. Its position coincides with the reported location of a \u201cguest star\u201d, an ancient Chinese term for transients, observed in May 48 BCE. 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