Queen Nzinga with Her Entourage, Kingdom of Kongo, 1670s by Antonio Cavazzi (Source).
Nzinga was a 17th century queen who thwarted Portuguese colonization with her military skill and diplomatic cunning. An excellent military strategist, she led troops into battle past the age of 60. Nzinga also provided a haven for escaped slaves, many of whom joined her army.
For more information: Stuff You Missed in History Class podcast, There’s Always a Seat for Queen Nzinga, January 30, 2012