A study of the molecular phylogeny of bishops and widowbirds published in 2008 found that it formed part of a clade along with the Fire-fronted Bishop (E. diadematus), Black-winged Red Bishop (E. hordeaceus), Northern Red Bishop (E. franciscanus), Southern Red Bishop (E. orix), Zanzibar Red Bishop (E. nigroventris) and Red-collared Widowbird (E. ardens).
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E. g. friederichseni Fischer and A. Reichenow, 1884, or Southern Black Bishop, inhabits Kenya and Tanzania around Babati, and sporadically to Lake Manyara and Serengeti National Park; possibly along Southern Uaso Nyiro River.
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In the superior right is placed a scapulary that evokes the Virgin Carmen, patron of the town, and a black bishop hat that alludes to San Juan Nepomuceno, bishop and martyr.