The Sebola or Tshivhula are from DRC under the name Rotswi in the Early 500AD and they arrived at place called Thatshane present day is called Alldays in Limpopo.
Remember they carried a status of the kingdom .under this clan name they then established their kingdom in that which all in all they place was called soutpansberg west (waterpoort, Alldays,Musina, Vivo,Dendron, Mopane, Vivo, Mara (Buysdorp) King kgwara is one of they king who rule at the kingdom of Mapungubwe as is popularily known today, whom according to the information i got he was buried inside Mapungubwe.
So he’s king Ramasunzi who was the last ruler at Mapungubwe when the disbanded due to weather changes. By that time his brother decided to go to Zimbabwe and established the kingdom of monomutapa, while King Ramasunzi stayed behind.
Now after Ramasunzi passed on, here are the names which falls under Ramasunzi ( children of Ramasunzi, ,Tshivhula or Sebola,, Lishiba, Maphari, musholombi, Machete, Toporo just to mention a few l can give you graveyard where this great king was buried, at around 1200 to 1300 AD.
So yes the biggest kingdom in SA is for this clan no question about it, only one surname among the one I mentioned are King of this great clan.
Ready to explain everything in the comments if you are interested.