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A strong emission line at 6703A has been detected in the optical spectrum forthe host galaxy (R=23.1) of the radio source RC J0311+0507 (4C+04.11). Thisradio galaxy, with a spectral index of 1.31 in the frequency range 365-4850MHz, is one of the ultrasteep spectrum objects from the deep survey of a skystrip conducted with RATAN-600 in 1980-1981. We present arguments in favor ofthe identification of this line with Ly\alpha at redshift z=4.514. In thiscase, the object belongs to the group of extremely distant radio galaxies ofultrahigh radio luminosity (P_{1400}=1.3 x 10^{29}W Hz^{-1}). Such power can beprovided only by a fairly massive black hole (~10^9M_\sun}) that formed in atime less than the age of the Universe at the observed z(1.3 Gyr) or had aprimordial origin.

RC J0311+0507: A Candidate for Superpowerful Radio Galaxies in the Early Universe at Redshift z=4.514