Portrait of the Voortrekker leader <a href="https://en.wikipedia.org/wiki/Andries_Pretorius" class="extiw" title="en:Andries Pretorius">Andries Pretorius</a>
"Artist unknown" (according to Britannica).
<a rel="nofollow" class="external text" href="http://www.britannica.com/EBchecked/topic/475588/Andries-Pretorius">Encyclopedia Britannica</a> page; source given there as "South African Information Service". Same picture appears as frontispiece of Preller, Gustav S (1937). <i>Andries Pretorius : lewensbeskrywing van die Voortrekker Kommandant-Generaal</i>. Johannesburg: Afrikaanse Pers Beperk. OCLC 638498119. Archive of online auction for this book <a rel="nofollow" class="external text" href="https://www.webcitation.org/6X6jrXuOm">here</a>.