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We present selected results on the X-ray spectroscopy of distant, obscuredAGN as obtained with the ultra-deep (~3 Ms) XMM-Newton survey in the ChandraDeep Field South (CDF-S). One of the primary goals of the project is tocharacterize the X-ray spectral properties of heavily obscured andCompton-thick AGN over the range of redshifts and luminosities that arerelevant in terms of their contribution to the X-ray background. The ultra-deepexposure, coupled with the XMM detector's spectral throughput, allowed us toaccumulate X-ray spectra for more than 100 AGN to investigate the absorptiondistribution up to z~4.

The ultra-deep XMM survey in the CDFS: X-ray spectroscopy of heavily obscured AGN