Literally, the diocese is the Anglican bishopric of the heart of the octopus of the North Island of Aotearoa, New Zealand; also known as the synod (or in Māori: Te Hui Amorangi).

In 2015 the Pīhopatanga (bishopric) underwent a major restructure which resulted in the disestablishment of Archdeaconries and the merging of some Pariha (parish).

It also led to the creation of the role of Te Manutaki, a senior cleric who, on behalf of the bishop, oversees and implements the mission and ministry of the Amorangi.

Since 2017, David Moxon (archbishop emeritus) has served as He Pīhopa Āwhina (an honorary assistant bishop).

Archdeacon Simmonds is also the Chaplain to Kingi Tuheitia Potatau Te Wherowhero VII, the Maori King.