The Caste system in Sri Lanka is a division of society into strata, similar to the Jāti system found in India. Yezidi society is hierarchical. In Yemen there exists a hereditary caste, the African-descended Al-Akhdam who are kept as perennial manual workers.Various sociologists have reported caste systems in Africa.he caste system in Sri Lanka is a division of society into strata, influenced by the textbook Varnas and Jāti system found in India. Ancient Sri Lankan texts such as the Pujavaliya, Sadharmaratnavaliya and Yogaratnakaraya and inscriptional evidence show that the above hierarchy prevailed throughout the feudal period.