  We present the aim and the status of the BLEIS project currently under
development at SISSA. This project consists in selecting a complete Blazar
sample from deep optical data, down to B=24.6, V=24.4 and I=23.7 (80%
completness). The optical images are taken from the ESO Imaging Survey (EIS -
Wide), a public survey covering ~16 deg2 of the Southern Emisphere. This new
Blazar sample, thanks to the different energy band of the selection and to the
faintness of EIS images, will be useful not only in understanding the physics
of such objects, but also in evolutive and cosmological studies. It will also
be a new test for the unified models of AGNs and will be helpful in making
predictions for future deep surveys.
