  Seyfert nuclei are typical active galactic nuclei (AGNs) in the local
universe, which are thought to be powered by gas accretion onto a supermassive
black hole (SMBH). The dynamical effect exerted either by non-axisymmetric
gravitational potential (such as a stellar bar) or by interaction with other
galaxies has been often considered to cause the efficient gas fueling. However,
recent systematic studies for large samples of Seyfert nuclei have shown that;
1) Seyfert nuclei do not prefer barred galaxies as their hosts, and 2) only
$\simeq$ 10% of Seyfert galaxies have companion galaxies. These findings raise
again a question; "What is important in the fueling of nuclear activity ?" Here
we suggest that an alternative fueling mechanism, the minor-merger (i.e.,
mergers between a gas-rich disk galaxy and a bound, less-massive satellite
galaxy) driven fueling appears consistent with almost all important
observational properties of Seyfert galaxies. Nucleated (i.e., either a SMBH or
a dense nuclear star cluster) galaxies and satellites seem necessary to ensure
that the gas in the host disk is surely fueled into the very inner region
(e.g., $\ll$ 1 pc). Taking account that local quasars may be formed by major
mergers between/among galaxies, we propose that all the AGNs in the local
universe were made either by minor or by major mergers.
