The Fermi Gamma-ray Space Telescope with its main instrument onboard,
the Large Area Telescope, opened a new era in the study of high-energy
emission from Active Galactic Nuclei. When combined with contemporaneous
ground- and space-based observations, Fermi-LAT achieves its full
capability to characterize the jet structure and the emission mechanisms
at work in different classes of radio-loud AGN, i.e. blazars, radio
galaxies and narrow-line Seyfert 1 galaxies.

In this talk I will discuss the broad-band properties of
gamma-ray-emitting AGN, highlighting major findings and open questions
regarding the jet physics, cosmological evolution, and accretion
processes of super-massive black holes in the Fermi era.
Furthermore, I will discuss the perspectives for future studies of
relativistic jets in AGN with the Large Synoptic Survey Telescope from
near-infrared to ultraviolet and the Cherenkov Telescope Array at Very
High Energy.