In the year 1875 BOSAR Patuan later dubbed the King Ompu Pulo Batu, Sisingamangaraja ditabalkan to Si XII in Bakara. The Singamangaraja XI (Ompu Sohahuaon), Singamangaraja XII Si's father, in fact has served as King-Priest Batak in a long period of time (50 years), namely from 1825 until 1875, ie after the lord Rau, advocates of Wahhabism was killed The Singamangaraja X (Ompu Master Nabolon) in the year 1825 near Siborong-borong.

      According to the Batak customs, the eldest son of a family that preferred to continue the work and functions of his parents, especially in the field of customs and government. That's why the people in Bakara and surrounding areas to be Ompu Parlopuk The Singamangaraja XII.
But because to be a Si Singamangaraja, a person must have a charismatic characters as well. Requirements that must be met by people who will be the successor to the leadership of the kingdom and faith Singamangaraja. Kharimatis leadership must exist at each Si Singamangaraja, which in the past, always believed in absolute terms than the leadership in the kingdom, by the people who are still influenced by the magical atmosphere and mystis, the candidate must be able to revoke Singamaraja Piso densely packed style of holster, to rain and making signs extraordinary (miracle). This requirement was in fact not be met by Ompu Parlopuk but can be met by his brother, namely Patuan BOSAR. Piso Gaja was densely packed around since the Singamangaraja I are about the middle of the sixteenth century AD. 

Piso Gaja is the symbol of the kingdom of densely packed Si Singamangaraja. Keris keris was not any. This long keris is one of the most important in the kingdom which began Singamangaraja and headquartered in Bakara, the edge of Lake Toba, only about 8 km from the beautiful island of Samosir is.




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