The Eastern Cape as a South African Province came into existence in 1994 and incorporated areas from the former Xhosa homelands of the Transkei and Ciskei, together with what was previously part of the Cape Province. This resulted in several anomalies including the fact that the Province has four supreme courts (in Grahamstown, Port Elizabeth, Bhisho and Mthatha) and enclaves of KwaZulu-Natal in the province. The latter anomaly has fallen away with amendments to municipal and provincial boundaries.The province is also made of Mpondo tribe, which primitively descended from Xhosa clan. Some of the Mpondo tribe went to this province when they were running away from King Shaka's war. Mpondo people are more closely related to Xhosa, as they use Xhosa as their main home language. There are other tribes that erroneously referred to as Xhosa people such as : AmaMpondo, AbaThembu, AmaMpondomise, AmaHlubi, AmaBhaca, AmaXesibe, AmaBomvana and other tribes.

(info: Wikipedia)