Why did missionaries play an important role in documenting Niger-Congo languages?

Missionaries played a pivotal role in documenting Niger-Congo languages primarily because they were responsible for the vast majority of linguistic research—including vocabularies and grammars—produced during the 19th century. Their work was essential for early academic efforts to classify these languages.12

For instance, missionaries like Giacinto Brusciotto published early grammatical studies of the Kongo language, while others, such as J.G. Christaller, provided insightful analyses of language structures. Additionally, the German missionary Sigismund W. Koelle produced the monumental Polyglotta Africana in 1854, which collected word lists from 156 languages. By grouping these languages based on perceived relationships, Koelle’s work provided a foundational framework that aligns closely with modern classifications of the Niger-Congo family. While the quality of these missionary-led efforts varied and was sometimes limited by the application of Latin grammatical structures, their extensive documentation provided the necessary data for later scholars to establish the genetic relationships within the Niger-Congo family.12