Carlisle Cullen. ;-)
Anyway - this is a really good point, but I'll point out something else. Most of the wealthy would-be trillionaires whose fortunes got wiped out passed down another inheritance: their genes. Those same disasters that wipe out the savings of the rich tend to kill the poor, who simply can't afford transportation away from disaster areas, bribes for border guards and security forces, political connections to ensure safety for their children, or information savvy to know when a crisis is coming.
Most of today's middle class is descended from the kings and nobility of the high middle ages. The peasantry just mostly died out, leaving no descendants.