The blog Life in Saudi Arabia has a page on an event that supposedly happened in the year 1164 AD, summarized briefly as follows:
Nur ad-Din had the same dream three times where he saw Muhammad, who showed him "faces". Taking these dreams as being prophetic, the Sultan went to Medina and gave alms to the people. He asked if there are other people that don't receive alms. There were two who didn't, and the Sultan located them and found out they were Christians who were digging a tunnel to try to steal Muhammad's body. The Sultan then had them killed.
Google shows many slight variations on this story, so it is a notable claim.
Are there any records that this really happened?