What happened to Cio-Cio-San’s father before the events of Madama Butterfly?

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In the opera Madama Butterfly, Cio-Cio-San’s father committed ritual suicide after receiving an invitation to do so from the emperor.1

When Cio-Cio-San shows her possessions to Benjamin Franklin Pinkerton, she includes a mysterious narrow box that she initially refuses to open. Goro, the marriage broker, later reveals to Pinkerton that the box contains a knife used by her father to carry out this act.1