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Active galactic nuclei (AGNs) exhibit variability across the entireelectromagnetic spectrum with distinct flaring episodes at differentfrequencies. The high sensitivity and nearly uniform sky coverage of the LargeArea Telescope on board the Fermi satellite make it a powerful tool formonitoring a large number of AGNs over long timescales. This allowed us todetect several flaring AGNs in gamma rays, triggering dedicated multifrequencycampaigns on these sources from radio to TeV energies. We discuss the resultsfor two different types of flaring AGN: the flat spectrum radio quasar 3C 279,in particular the coincidence of a gamma-ray flare from this source with thedrastic change of the optical polarization angle, and the first gamma-ray flarefrom a radio-loud narrow-line Seyfert 1, PMN J0948+0022.

Flaring Active Galactic Nuclei. The cases of 3C 279 and PMN J0948+0022 as seen by the Fermi-LAT