Despite being appointed by a powerful faction in Machame as a temporary solution, Ngulelo established himself in the position of mangi and maintained his rule uninterrupted for a period of 16 years, from 1901 until 1917.

[7] During Ngulelo's rule, tensions in the Kikafu region significantly decreased, particularly among the communities east of the river, which had previously experienced clan rivalries and grievances over land appropriations.

His efforts to reconcile the east and west left a lasting positive impression on the eastern communities, who appreciated his equitable treatment of their western counterparts, contrasting it with the exploitative practices of Shangali and his successors.

Notably, he was the only chief of Machame from the early 19th century, beginning with Rengua, to govern without the traditional magical regalia associated with chiefly power, which remained in the possession of Shangali and were later inherited by his descendants.

Despite this lack of magical symbols, Ngulelo maintained a secure position, especially after 1905, when his authority was reaffirmed with the reinstatement of Mangi Marealle, diminishing Shangali's influence and attempts to reclaim the throne.

[11] Over time, the relationship between the missionaries and Chagga leadership shifted, with Müller, a prominent Lutheran figure in northern German East Africa, ultimately preferring Ngulelo over Shangali.

Following Ngulelo's deportation, Merinyo assumed control of the kingdom and effectively acted as Mangi for several months, ruling harshly with the support of askaris from Moshi.

Reflecting on his 16 years as mangi in 1959, Ngulelo recalled a period of peace and his commitment to the welfare of the impoverished, noting that he took decisive action against oppressors.

However, the transition from German to British colonial authority created opportunities for politically ambitious Chagga factions to challenge the established Kingdoms across Kilimanjaro.