  We present preliminary results of a search for galaxies at z>4 through
Lyman-limit imaging of the fields of known high-redshift radio-galaxies.
Objects were selected by means of their broad-band colours, and spectroscopy of
candidate objects in one of the fields has been performed through multi-slit
spectroscopy at the 4.2m William Herschel Telescope. These spectra show some of
the first z>4 galaxies to be identified using the Lyman break technique.
