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We present near--infrared observations of the ultraluminous high-redshift(z=2.286) IRAS source FSC 10214+4724 obtained in 0.''4 seeing at the W. M. Kecktelescope. These observations show that FSC 10214+4724 consists of a highlysymmetric circular arc centered on a second weaker source. The arc has anangular extent of about 140 degrees and is probably unresolved in thetransverse direction. This morphology constitutes compelling prima facieevidence for a gravitationally lensed system. Our images also contain evidencefor the faint counter image predicted by the lens hypothesis. The morphology ofFSC 10214+4724 can be explained in terms of a gravitationally lensed backgroundsource if the object at the center of curvature of the arc is an L* galaxy at z~ 0.4. If FSC 10214+4724 is lensed then there is significant magnification andits luminosity has been overestimated by a large factor. Our results suggestFSC~10214+4724 is not a uniquely luminous object but ranks amo ng the mostpowerful quasars and ultraluminous IRAS galaxies.Comment: 17 pages with 4 figure

High-Resolution Infrared Imaging of FSC 10214+4724: Evidence for Gravitational Lensing