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We report on the discovery of the X-ray luminous cluster XMMUJ100750.5+125818 at redshift 1.082 based on 19 spectroscopic members, whichdisplays several strong lensing features. SED modeling of the lensed arcfeatures from multicolor imaging with the VLT and the LBT reveals likelyredshifts ~2.7 for the most prominent of the lensed background galaxies. Massestimates are derived for different radii from the velocity dispersion of thecluster members, M_200 ~ 1.8 10^{14} Msun, from the X-ray spectral parameters,M_500 ~ 1.0 10^{14} Msun, and the largest lensing arc, M_SL ~ 2.3 10^{13} Msun.The projected spatial distribution of cluster galaxies appears to be elongated,and the brightest galaxy lies off center with respect to the X-ray emissionindicating a not yet relaxed structure. XMMU J100750.5+125818 offers excellentdiagnostics of the inner mass distribution of a distant cluster with acombination of strong and weak lensing, optical and X-ray spectroscopy.

XMMU J100750.5+125818: A strong lensing cluster at z=1.082