The second Khalifa was Ali Wad Helu, the chief of the powerful Degheim and Kenana tribes, who also largely contributed to the Mahdi's success. The third was Ali Esh Sherif, a Dongolawi, and son-in-law of the Mahdi; the title of Sherif, or noble, was given to him as being a member of the Mahdi's family; he was the representative of the Gellabas (or traders), and of the inhabitants of Gezireh,[B] Berber, and Dongola. Ali Sherif was in reality the last Khalifa, for a fourth was never appointed. The Mahdi asked the son of Sheikh Senussi, as by his influence he thought to win over Egypt, but he refused the honour, and in consequence no one else was nominated to fill the place, though strenuous efforts were made by the more ambitious adherents to secure this much-coveted position; and it is needless to add that several who sought the honour were relegated to prison as possible rivals. The Khalifa Abdullah is now about forty-three years of age, has a dark copper-coloured complexion, much marked by small-pox, an intelligent face, and is a man of great energy. He is gifted by nature with common sense, but he has had no education, and can neither read nor write. The Khalifa Ali is rather short, and if he were only a little taller would pass for a good-looking man; he has a ruddy complexion, and wears a large beard; he was educated at the El Azhar university in Cairo, and has a considerable knowledge of Islam theology. He is at present under forty years of age, and should succeed Abdullah. The Khalifa Sherif is not at present more than twenty-one years of age. These three Khalifas were the commanders-in-chief of the army, of which each section had its own special distinctions, whilst the Mahdi himself had no distinctive military insignia--neither flag nor drum. Each Khalifa had his own Jehadieh, or regular troops, his cavalry and lance-bearers, all from the tribe to which he himself belongs; each had also his own distinctive flag; Abdullah's the Raya Zerga, or black flag; Ali's the Raya el Hamra, or red flag; and Sherif's the Raya el Hadra, or green flag; each Khalifa had in addition his own war-drums made of brass, and which were therefore called "nahas," in contradistinction to the ordinary drums known as "noggara," which are made of wood, over which a piece of skin is tightly stretched; the Khalifa Abdullah had also the onbaïa, a very powerful wind instrument made of an elephant's tusk, hollowed out, and which when blown has a very loud and impressive sound.