Blazars are the most interesting objects among AGN, both for their high luminosities and physical properties. We propose a project on multiwavelength studies of blazars based on the compilation of a homogeneous large sample of such objects (~5000 blazars) and cross-correlations with available catalogues from gamma-ray to radio. A Catalogue of Blazars and online spectral database will be released. Statistical analysis of the sample will be carried out to establish average properties of blazars and possibly find their subclasses. Optical and radio variability for the blazar sample will be established. A revised classification of blazars using the new data will be accomplished. Multiwavelength spectral energy distribution for all blazars using automated software will be built. The evolution of various characteristics of blazars with luminosity and redshift will be studied. The luminosity evolution of various blazar sub-samples will be compared. Our data will make possible the study of their physical properties and establish the homogeneous definition of blazar phenomenon.

	Dr. Areg MICKAELIAN, Principal Investigator Leading Researcher and Deputy Director at BAO, Director of IAU South West Asian Regional Office of Astronomy for Development (ROAD). Head of ArVO research group, Project Manager of DFBS, ArVO and BAO Plate Archive project (2015-2017), Principal Investigator of RA MES SCS Thematic Grant 15T-1C257 “Spectral and multiwavelength studies of Markarian Galaxies” (2015-2017). Management Committee member of H2020 COST Action TD1403 BigSkyEarth (2015-2019). Co-President (Acting President) of ArAS, Acting President of the IAU National Committee for Astronomy (NCA) in Armenia, Vice-Chair of EAAS, Executive Council member of IVOA, IPDA and SREAC, Resident Director of Isaac Newton Institute (INI) Armenian Branch (since 2000), Scientific Secretary of the International Steering Committee of Viktor Ambartsumian International Science Prize (since 2009), Director of Byurakan International Summer Schools (BISS), GTTP Armenian Ambassador, Review Editor of “Frontiers in Astronomy and Space Sciences”, member of editorial boards of Astron. Astrophys. Transactions, Open Astronomy J. and Open Conf. Proc. J. Works in the fields of astronomical surveys, AGN and starburst galaxies, Markarian galaxies, blue stellar objects, QSOs, IRAS and ROSAT sources, Virtual Observatories (VOs). Included in SCS Armenian 100 most productive scientists (since 2013).
	Dr. Marietta GYULZADYAN, Project Scientist Researcher at BAO. Member of ArVO research group, RA MES SCS Thematic Grant 15T-1C257 “Spectral and multiwavelength studies of Markarian Galaxies” (2015-2017) and BAO Plate Archive project (2015-2017). Lecturer of “Astronomy” at Yerevan Physical-Mathematical high school after A. Shahinian attached to YSU. Leader of Armenian students’ team at International Astronomical Olympiads (2007-presently), Jury member of the International Astronomical Olympiad (IAO) (since 2006), Jury member of the International Olympiad of Astronomy and Astrophysics (IOAA) (since 2012), GTTP Armenian Representative. Was awarded RA MES Gold Medal (2015) and GTTP Certificate (2011). Works in the fields of AGN and starburst galaxies, Markarian and SBS galaxies, IRAS galaxies, clusters of galaxies.
	Hayk ABRAHAMYAN, Project Scientist Junior Researcher and PhD student at BAO. Member of ArVO research group, RA MES SCS Thematic Grant 15T-1C257 “Spectral and multiwavelength studies of Markarian Galaxies” (2015-2017) and BAO Plate Archive project (2015-2017). Winner of ArAS Annual Prizes for Young Astronomers 2013, was awarded GTTP Certificate (2015). Works in the fields of AGN and starburst galaxies, extragalactic radio sources, Markarian galaxies, QSOs, blazars.
	Gurgen PARONYAN, Project Scientist Junior Researcher and PhD student at BAO. Member of ArVO research group, RA MES SCS Thematic Grant 15T-1C257 “Spectral and multiwavelength studies of Markarian Galaxies” (2015-2017) and BAO Plate Archive project (2015-2017). Head of BAO Plate Archive. Winner of ArAS Annual Prizes for Young Astronomers 2014. Works in the fields of AGN and starburst galaxies, X-ray properties of active galaxies, extragalactic radio sources, Markarian galaxies, QSOs, blazars.