Other tragedies include Bernabo Visconti, who wrongly imprisoned his nephew. Ugolino of Pisa, a count, was imprisoned in a tower in Pisa with his three young children after Ruggieri, the bishop of Pisa, had led a rebellion against him. His youngest son died of starvation, and out of his misery Ugolini gnawed on his own arms. The two children that remained thought that Ugolini was chewing himself out of hunger, and offered themselves as meals for him. They all eventually starved. Nero did nothing but satisfy his own lusts and even cut open his own mother to see the womb from which he came. He had Seneca murdered for stating that an emperor should be virtuous. When it appeared that Nero would be assassinated for his cruelty, he killed himself. Holofernes ordered his subjects to renounce every law and worship Nebuchadnezzar. For this sin Judith cut off Holofernes' head as he was sleeping.