Those from southern Arabia were known as the Yaman tribe, those from northern Arabia the Kais (Qais).
Only nine years after Mahommed's announcement of his mission they heard of the new prophet, and sent to Medina a deputation headed by a wise and holy man called Kais, to make inquiry.
From Kais and his three sons the whole of the genuine Afghans claim descent.
And one of the Afghan histories, quoted by Mr Bellew, relates " a current tradition " that, previous to the time of Kais, Bilo the father of the Biluchis, Uzbak (evidently the father of the Usbegs) and Afghana were considered as brethren.
The islands situated close to the northern shore of the Persian Gulf are Persian territory; they are, from east to west, Hormuz (Ormus), Larak, Kishm, Hengam, Furur, Kish (Kais), Hindarabi, Shaikh-Shuaib, Jebnin, Kharak, Kharaku (Khorgu).