What was the ultimate end of Frederick II's brilliant reign and many accomplishments?

Question

Quizplus · Accepted Answer

Despite Frederick II's many accomplishments and successes during his reign, his enemies ultimately wiped out his dynasty and undid much of his work after his death. His son, Conrad IV, was unable to hold onto power and the Hohenstaufen family line ended with him. Frederick's death marked the beginning of a long period of political instability in Germany and Italy.

What Was the Ultimate End of Frederick II's Brilliant Reign