Pretoria was founded in 1855 by Marthinus Wessel Pretorius. He was a leader of the Voortrekkers. Pretoruis named the city after his father Andries Pretorius. Andries Pretorius had become a hero of the Voortrekkers after the Battle of Blood River. The city became the capital of the South African Republic (ZAR) on May 1, 1860.