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We present the results of a search for X--ray luminous distant clusters of galaxies. We found extended X--ray emission characteristic of a cluster towards two of our candidate clusters of galaxies. They both have a luminosity in the ROSAT bandpass of ≃10^44 erg s^-1 and a redshift of >0.5; thus making them two of the most distant X--ray clusters ever observed. Furthermore, we show that both clusters are optically rich and have a known radio source associated with them. We compare our resultdoi:10.1086/174585 fatcat:liwuvkyxqbffzgpfwfctrgjoke