dominant Christian theology was brought by Lutheran German missionaries in the 19th century, including the well-known missionary Ludwig Ingwer Nommensen. Christianity was introduced to the Karo by Dutch Calvinist missionaries, and their largest church is the GBKP (Gereja Batak Karo Protestan). The Mandailing and Angkola Batak were converted to Islam in the early 19th century during the reign of Minangkabaus Padri. A significant minority of Batak people do not adhere to either Christianity or Islam, however, and follow traditional practices known as the agama si dekah, the old religion, which is also called perbegu or pemena. Dalihan Na Tolu Dalihan Na Tolu (three-legged furnace) is the philosophy of life of the Batak people. It was consisted of three general rule in Batak society. Those are: Somba Marhulahula (showing respect to wife's family). Even though somba could mean worship, in Dalihan Na Tolu, it means respect to those with wife family and those with the same clan (Marga (Batak)). Those family includes wife of the grandfathers, wife of the fathers, and wife of the children. Elek Marboru (showing kindness to all women). Kindness in this context means not accompanied by ulterior motives and self-interest. Also, women in this context means the family who marry the daughter, including the daughter itself. Manat Mardongan Tubu (careful in living with close relatives). Living carefully means a cautious attitude towards fellow Marga to prevent misunderstandings in the implementation of custom tradition events. This act was reflected in the Batak proverb "hau na jonok do na boi marsiogoson" (only woods that are really close can cause friction). This illustrates that it is in close and frequent intercourse that possible conflicts of interest, status, etc. can occur The essence of this teachings is the moral code contains the teachings of mutual respect (masipasangapon) with the support of the moral rule: mutual respect and helpfulness. Ritual cannibalism Ritual cannibalism was well documented among pre-colonial Batak people, being performed in order to strengthen the eater's tendi. In particular, the blood, heart, palms and soles of the feet were seen as rich in tendi. In Marco Polo’s memoirs of his stay on the east coast of Sumatra (then called Java Minor) from April to September 1292, he mentions an encounter with hill folk whom he refers to as "man-eaters". From secondary sources, Marco Polo recorded stories of ritual cannibalism among the "Battas". Marco Polo's stay was restricted to the coastal