  We report on a study of long-term flux variations in a sample of more than
1000 AGN observed with ROSAT and in the XMM-Newton slew survey. Over a period
of 3-19 years, NLS1 galaxies as a class are found to be only slightly more
variable than broad line Seyfert galaxies, despite the strong short term
variability seen in some bright nearby NLS1s. Contrary to expectations, it is
Seyfert II galaxies that exhibit the greatest flux volatility. One particular
Sy II, which has brightened by a factor > 300 over 15 years, has been monitored
in detail with Swift and XMM. The spectrum is extremely soft (kT \sim 60eV)
consistent with pure thermal emission from an accretion disk and reminiscent of
ROSAT observations of the NLS1,WPVS 007. We show that this is likely to be a
"true" Sy II, without a BLR, and speculate that in its new high luminosity
state we may be able to witness a BLR in formation.

Cosmology and Nongalactic Astrophysics