  We report the discovery of an unusual low--ionization broad absorption line
quasar at z=1.776 which exhibits absorption lines from many excited states of
Feii. This member of the rare class of 'FeLoBAL' quasars was serendipitously
found in a mid-infrared (MIR) survey of distant clusters carried out with the
ISOCAM camera. ISO J005645.1-273816 has a high MIR to UV luminosity ratio,
suggesting a strong dust obscuration plus emission from very hot dust. This
characteristic makes MIR surveys particularly efficient at detecting LoBAL
quasars.
