Original: The Sullubawa are a Fulani clan in Northern Nigeria, the current ruling houses of Kano, Ringim and Katsina belong to the clan and another amongst the four ruling Houses of Zazzau Emirate .
Revised: The Sullubawa are a Fulani clan in Northern Nigeria, the current ruling houses of the ancient Sahelian city-states of Kano and Katsina belong to the clan and another amongst the four ruling Houses of Zazzau Emirate .
Edit intent: clarity