It was the dreaded Hildegard von Blingin'.

Be warned on clicking yonder hyperlinks least ye be similarly afflicted!

https://www.youtube.com/watch?v=cRIfsFefatg

Varily they did try to summon a hero during those dark days: https://www.youtube.com/watch?v=Nx-x_1lIXh4

But lo, some tried to escape by way of sea: https://www.youtube.com/watch?v=u9eSnSBP1Po

Some say this evil lasted as late as 1576: https://www.youtube.com/watch?v=e6LOWKVq5sQ