How did Qedar قيدار become the head of the 12 Princes of Ismaʿil إِسْمَاعِيل (A"S)

How did قيدار Qedar become the head of the 12 Princes of Ismaʿil (A"S) and custodian of the Ka'aba & the Ark (according to the sources which state this)? Sifr at-Takween lists Nebayut نَبَايُوت as the firstborn of Ismaʿil(A"S). Was Qedar appointed by Ismaʿil (A"S)?