The Jakhanke -- also spelled Jahanka, Jahanke, Jahanque, Jahonque, Diakkanke, Diakhanga, Diakhango, Dyakanke, Diakhanké, Diakanké, or Diakhankesare -- are a Manding-speaking ethnic group in the Senegambia region, often classified as a subgroup of the larger Soninke. The Jakhanke have historically constituted a specialized caste of professional Muslim clerics (ulema) and educators. They are centered on one larger group in Guinea, with smaller populations in the eastern region of The Gambia, Senegal, and in Mali near the Guinean border. Although generally considered a branch of the Soninke (also known as Serahule, Serakhulle or Sarakollé), their language is closer to Western Manding languages such as Mandinka. Since the fifteenth century the Jakhanke clerical communities have constituted an integral part of the region and have exercised a high level of economic and religious influence upon Soninke as well as related Manding-speaking communities (such as the Dyula and Mandinka) in what is now Mali, Guinea, Senegal, and The Gambia. The endogamous Jakhanke clerics were influential in the diffusion of Islam among the Manding people in West Africa. While originally a religious caste of the Sarakollé, the Jakhanke later facilitated the trans-Saharan trade routes as merchants, such as in coastal rice and slaves, from the Guinea and Gambian coasts to the interior from at least the 17th century. In this way they are often compared with the Dyula, who formed a trade diaspora from the heartlands of the Mali Empire to the coast of what is today Côte d'Ivoire. According to Levtzion, "The Mande-speaking Muslim traders, with whom the Portuguese negotiated on the Gambia were Diakhanke. The Diakhanke clans are of Soninke origin, and their traditions go back to Dinga, ancestor of the ruling dynasty of the ancient kingdom of Wagadu. They remember Dia in Massina as the town of their ancestor, Suware, a great marabout and a saint." They later established Diakka-ba in Bambuk.