Agrippina the Younger outraged by Claudius' adoption of Nero and his choice of Nero as successor, instead of choosing his own son Britannicus. Nero and Octavia were married on June 9, 53. Claudius later repented of marrying Agrippina and adopting Nero, began to favor Britannicus, and started preparing him for the throne. His actions allegedly gave Agrippina a motive to eliminate Claudius. The ancient sources say she poisoned Claudius on October 13, 54 with a plate of deadly mushrooms at a banquet, thus enabling Nero to quickly take the throne as emperor. Accounts vary wildly with regard to this private incident and according
Agrippina the Elder Agrippina the Elder merely standing on a bridge waving the soldiers passing by, whereas her daughter eclipses her by presiding over a military tribunal and accepting gifts from foreign ambassadors. Tacitus also records serious tension between Agrippina and Livia. He describes Livia as having visited "stepmotherly provocations" on Agrippina. He says of Agrippina: "were it not that through her moral integrity and love for her husband she converted an otherwise ungovernable temper to the good" (Tacitus, "Annals" 1.33). Despite being sympathetic to her as a victim of imperial oppression, he uses expressions like "excitable", "arrogant", "proud", "fierce", "obstinate", and "ambitious"