Amharic language
Abba Gorgoryos worked with Hiob Ludolf in co-authoring the earliest grammar of the Amharic language, as well as an Amharic-Latin dictionary, which became the first African language to be translated to Latin. Ludolf's book "A History of Ethiopia" was based in part on Abba Gorgoryos's conceptualization of Ethiopia and letters. Abba Gorgoryos also developed a Ge'ez lexicon.