Historical clue formulations

• Louis ___, South Africa's first P.M. — 2019-08-07
• 1980s P.M. nicknamed "The Old Crocodile" — 2015-02-07
• De Klerk succeeded him — 2015-01-03
• 1980s South African president — 2011-04-13
• South African politico — 1998-07-07
• DeKlerk's predecessor — 1995-08-26