The study of high redshift radio galaxies has been boosted for the last years
due to new techniques and new technologies. Using the ultra steep radio
spectrum as a selection criterion has been shown (Chambers et al., 1987)
to be an efficient technique for locating very distant radio galaxies. Based on
this selection criterion, Chambers et al. began a multi-spectral
investigation with the most sensitive instruments available to observe the
ultra steep spectrum radio source sample of Tielens et al. (1978). They found
lots of distant radio galaxies including 4C41.17, the most distant galaxy
currently known, at a redshift of (Chambers, 1989). These galaxies
are different in many respects. All these sources are for instance strong Lyman
emitters.