Answer
The answer is Mutawalli. Umaru Yar'Adua's father, Musa Yar'Adua, held the position of Mutawalli, which is a traditional title given to the head of the kingmakers in the Katsina Emirate in present-day Nigeria. The Mutawalli plays a significant role in the selection and appointment of a new emir, serving as a kingmaker and advisor to the emir.