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With the goal of identifying high‐redshift radio galaxies with Fanaroff–Riley class I (FR I) classification, here are presented high‐resolution, wide‐field radio observations, near‐infrared and optical imaging and multi‐object spectroscopy of two fields of the Leiden–Berkeley Deep Survey. These fields, Hercules.1 and Lynx.2, contain a complete sample of 81 radio sources with   S  1.4 GHz  &gt; 0.5 mJy  within 0.6 deg 2 . This sample will form the basis for a study of the population and cosmic evolution of high‐redshift, low‐power, FR I radio sources which will be presented in Paper II. Currently, the host galaxy identification fraction is 86 per cent with 11 sources remaining unidentified at a level of   r ′≥ 25.2 mag  (Hercules; four sources) or   r ′≥ 24.4 mag  (Lynx; seven sources) or   K ≳ 20 mag . Spectroscopic redshifts have been determined for 49 per cent of the sample and photometric redshift estimates are presented for the remainder of the sample.

A sample of mJy radio sources at 1.4 GHz in the Lynx and Hercules fields – I. Radio imaging, multicolour photometry and spectroscopy