In 1835, the
French Academy commissioned Antoine d’Abbadie to undertake a scientific mission to Brazil. The findings of this expedition were later published in 1873 They traveled extensively throughout Ethiopia, reaching as far south as the
Kingdom of Kaffa. Often journeying together but occasionally venturing separately, their explorations encompassed scientific research and political engagement. Antoine, in particular, immersed himself in local political dynamics, advocating for French interests and supporting
Catholic missionary efforts. At the beginning of the 19th century,
Protestant missions began to be established in Ethiopia.
Father Sapeto, a
Vincentian from the Syrian mission, joined Antoine and Arnaud d'Abbadie in Cairo in 1837. He wanted to become a missionary in Ethiopia and perhaps found a Catholic mission or die a martyr. He traveled from Massawa to Adwa with Arnaud d'Abbadie, and following Arnaud's advice, obtained permission from a religious tribunal to remain in Adwa to learn the language and customs of the country. When Antoine d'Abbadie returned to Europe in July 1837, Father Sapeto gave him letters to
Cardinal Fransoni, Prefect of the Congregation for the Evangelization of Peoples, requesting the Vatican's help in establishing his mission. The Vincentians
Justin de Jacobis and Montuoro joined Father Sapeto; the Vincentian mission was founded. On March 9, 1845, Antoine d'Abbadie, in a letter addressed to Cardinal Fransoni, proposed the establishment of a mission to the
Oromo population of the Horn of Africa. The proposal was approved by the Pope on March 1, 1846, and
Guglielmo Massaia was appointed Apostolic Vicar of the Oromos. Arnaud d’Abbadie held several distinguished roles in Ethiopia, including those of general, judge, and diplomat. He actively participated in battles and was granted the title of
Ras, one of the most esteemed honors in the country. Antoine, by contrast, followed an academic path and became a dedicated scholar. Reflecting on his time in Ethiopia, he remarked, "When residing in a foreign country without any known antecedents, it is advisable to adopt a vocation in line with local customs, as failure to do so may result in being branded as a political spy, a hazardous accusation in any nation. As I was unable to engage in combat, agriculture, or merchandising, I identified as a "mamhir", or teacher and scholar, during my time in Christian Ethiopia and received an education from their public and non-compulsory schools." During their extended stay, the two brothers fully assimilated into local customs. They exchanged their European attire for the turban and
toga of the Ethiopians and traversed the region barefoot, as, at the time, only lepers and Jews wore sandals. This cultural integration earned them warm receptions wherever they traveled. The d’Abbadie brothers undertook extensive expeditions throughout Ethiopia, documenting human and physical geography, religion, legislative texts, ethnography, philology, linguistics, numismatics, and history. During these journeys, Antoine d’Abbadie assembled about 250
ancient manuscripts and, with the assistance of the Ethiopian scholar
Debtera Tewelde Medhin of Welkait, compiled the first-ever Amharic-French dictionary of approximately 15,000 words. By late 1848, after completing their objectives, the brothers left Ethiopia. Antoine later published the scientific results of their work in Europe, notably
Géodésie d’Éthiopie (Paris, 1860–1873), illustrated with ten maps, and a volume of
Géographie de l’Éthiopie (1890). He also produced studies on Ethiopian geography, coins, ancient inscriptions, and magnetic observations from journeys to the Red Sea and the Levant. The general account of the brothers’ travels was published by
Arnaud in 1868 as
Douze ans de séjour dans la Haute-Éthiopie, later translated as
Twelve Years in Upper Ethiopia. In addition to these publications, Antoine d’Abbadie contributed to
geodesy by refining measurement techniques and inventing a new
theodolite for angle calculation. His work was challenged by
Charles Tilstone Beke, who questioned his account of the journey to
Kaffa and his claim that the
Blue Nile was the main branch of the Nile. Antoine was ultimately wrong about the Nile’s main stream; however, subsequent explorers confirmed his general reliability as an observer. ==Basque and bascophile==