After Viljoen retired from public life he maintained an interest in politics thereafter.
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Viljoen was elected to the House of Assembly as MP for Alberton, near Johannesburg, as President of the Senate, and as acting State President from 21 August 1978 to 10 October 1978, after which B.J. Vorster was briefly elected to the position.
Marais Viljoen (1915-2007), ceremonial State President of South Africa
Marais | Marin Marais | Le Marais | Viljoen | Marais-Vernier | Grand Marais | Marais Viljoen | Marais (surname) | Little Marais, Minnesota | Lettie Viljoen |