What is the story of Cleopatra wrapping herself up in a rug?

she was wrapped in a rug because people wanted her dead an she was trying to get back into Rome
Caesar had summoned Cleopatra to Alexandria in order to mediate the dispute between her and her brother. However, Cleopatra as the enemy of her brother, would have been killed on sight, so she devised a way of wrapping herself in a rug (or a laundry bundle as some sources say) in order to be delivered to Caesar.