Fredrick the Wise was said to have healing water

[1]"Time, perhaps, will show if I have
been a good diviner" (Frederick the Wise, 1517)

I recently compiled something on the Royal Touch.  It brought to mind something that Luther said about Fredrick the Wise.


‘Tis a curious thing that certain remedies, which, applied by princes and great lords, are efficacious and curative, are wholly powerless when administered by a physician. I have heard that the electors of Saxony, John and Frederick, have a water, which cures diseases of the eye, when they themselves apply it, whether the disorder arise from heat or from cold; but ‘tis quite useless when administered by a physician. So in spiritual matters, a preacher has more unction, and produces more effect upon the conscience than can a layman.