separation in November, but Mandela filed for divorce in January 1958; the divorce was finalised in March, with the children placed in Evelyn's care. During the divorce proceedings, he began courting a social worker, Winnie Madikizela, whom he married in Bizana in June 1958. She later became involved in ANC activities, spending several weeks in prison. Together they had two children: Zenani, born in February 1959, and Zindziswa (1960–2020). In December 1956, Mandela was arrested alongside most of the ANC national executive, and accused of "high treason" against the state. Held in Johannesburg Prison amid mass protests, they underwent a preparatory examination before being granted bail. The defence's refutation began in January 1957, overseen by defence lawyer Vernon Berrangé, and continued until the case was adjourned in September. In January 1958, Oswald Pirow was appointed to prosecute the case, and in February the judge ruled that there was "sufficient reason" for the defendants to go on trial in the Transvaal Supreme Court. The formal Treason Trial began in Pretoria in August 1958, with the defendants successfully applying to have the three judges—all linked to the governing National Party—replaced. In August, one charge was dropped, and in October the prosecution withdrew its indictment, submitting a reformulated version in November which argued that the ANC leadership committed high treason by advocating violent revolution, a charge the defendants denied. In April 1959, Africanists dissatisfied with the ANC's united front approach founded the Pan-Africanist Congress (PAC); Mandela disagreed with the PAC's racially exclusionary views, describing them as "immature" and "naïve". Both parties took part in an anti-pass campaign in early 1960, in which Africans burned the passes that they were legally obliged to carry. One of the PAC-organised demonstrations was fired upon by police, resulting in the deaths of 69 protesters in the Sharpeville massacre. The incident brought international condemnation of the government and resulted in rioting throughout South Africa, with Mandela publicly burning his pass in solidarity. Responding to the unrest, the government implemented state of emergency measures, declaring martial law and banning the ANC and PAC; in March, they arrested Mandela and other activists, imprisoning them for five months without charge in the unsanitary conditions of the Pretoria Local prison. Imprisonment caused problems for Mandela and his co-defendants in the Treason Trial; their lawyers could not reach them, and so it was decided that the lawyers would withdraw in protest until the