He was a member of the People's Representative Council from 1967 until 1971 and the Ephorus (chairman) of the Batak Christian Protestant Church (HKBP) from 17 February 1993 to 1 November 1998.

[1] Cyrellus was a priest in the Batak Christian Protestant Church and one of the first disciples of Ludwig Ingwer Nommensen.

[2] At the age of two and a half years old, Parlindungan suffered a severe disease that caused his skin to be covered in boils.

S. A. E. Nababan's continual dispute with his former rivals and his stance against the government led to a conflict between him and the government-backed opposition group.

[12] The opposition group teamed up with the government to foil the 51st Sinode Godang, which was held to elect a new Ephorus.

The 51st Sinode Godang ended up in chaos and failed to elect a new Ephorus, paving the way for a government takeover.

[13] The military authorities, who were called the Bakorstanasda (Regional Stability Coordinating Body), appointed S. M. Siahaan as the acting Ephorus.