Ngubengcuka Aa! Ndaba!, also known as Vusani, (c. 1790 – 10 August 1830) was the king of the abaThembu, in the eastern-southern part of Xhosaland (Eastern Cape). Ngubengcuka succeeded his father, Ndaba, as king in 1810. Known as Inkosi Enkhulu (Great Chief), Ngubengcuka united the Thembu kingdom before it was subjected to British colonial rule. He was the proverbial author and finisher of the modern kingdom that it eventually became.