Page "Agrippina the Younger" Paragraph 50

Tacitus claims that Nero considered poisoning or stabbing her, but felt these methods were too difficult and suspicious, so he settled on building a self-sinking boat.

Though aware of the plot, Agrippina embarked on this boat and was nearly crushed by a collapsing lead ceiling only to be saved by the side of a sofa breaking the ceiling's fall.

Though the collapsing ceiling missed Agrippina, it crushed her attendant who was outside by the helm.