Johann Peter von Ludewig (1729):
In this very place a baptized Moor by the name of Mister Anton Wilhelm Amo, in the service of His Highness the Duke of Wolfenbüttel, spent some years for the purpose of studying. And after he had attained a proficiency in the Latin language, he showed such dedication and success in the lessons of private and public law that he became very well versed in this field. After this, with the consent of his most merciful Highness, who had supported him until know, he was permitted by the Chancellor von Ludwig to hold a public disputation under his [the Chancellor's] presidence. So that the argument of the disputation should be appropriate to his situation, the topic De iure Maurorum in Europa, or the law of Moors, was chosen. Therein it was not only shown from books and from history, that the kings of the Moors were enfeoffed by the Roman Emperor, and that every one of them had to obtain a royal patent from him, which Justinian also issued, but it was also investigated how far the freedom or servitude of Moors bought by Christians in Europe extends, according to the usual laws.
Hieselbst hat sich ein in Diensten Sr. Hochfürstl. Durchl. des regierenden Hertzogs von Wolfenbüttel stehender getaufter Mohr Namens Herr Antonius Wilhelmus Amo, einige Jahre Studirens halber aufgehalten. Und nachdem er vorhero die Lateinische Sprache zum Grund geleget hat er hier die collegis iuris priuati und publici mit solchem Fleiß und succeß getrieben, daß er in solchem studio ziemlich geübet. Solchem nach er sich mit Vorbewußt seiner gnädigsten Herrschaft welche ihn bisher allhier unterhalten bey dem Herrn Cantzler von Ludewig angegeben unter deßen praesidio sich mit einer disputation öffentlich hören zu lassen. Damit nun das argument der disputation seinem Stande gemäß seyn möchte; so ist das thema de iure mavrorum in Europa oder vom Mohrenrecht beliebet worden. Darinnen daß nicht allein ex LL und der Historie gezeuget; daß der Mohren ihr König bey dem Römischen Kayser ehedem zu Lehen gegangen und jeder von denselben ein Königs-Patent welches auch Justinianus augetheilet hohlen müssen; sondern auch vornehmlich dieses untersuchet wie weit den von Christen erkaufften Mohren in Europa ihre Freyheit oder Dienstbarkeit denen üblichen Rechten nach sich erstrecke.
From Wöchentlichen Hallischen Frage- und Anzeigungs-Nachrichten, 28 November, 1729.
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Johann Heinrich Zedler (1739):
Amo (Anton Wilhelm), a baptized Moor, originally from Guinea in Africa. His Highness the Elector of Braunschweig-Wolfenbüttel, at his own expense, sent Amo to study philosophy and law for some years at Halle. In the year 1729, in the month of November, he defended a dissertation in law, with the Chancellor von Ludwig presiding, entitled De jure Maurorum in Europa, or on the law of Moors. In this work he showed from laws and histories that the kings of the Moors were enfeoffed under the Roman Emperor, and that each of them had to obtain a royal patent, which Justinian also issued. After this, he investigates how far the freedom or servitude of baptized Moors in Europe extends according to the usual laws (see Ludwig's Universal-Historie, Part 5, p. 251). From this he obtained the Master's degree, and for some time gave private lessons in Halle (see Dreyhaupt's Beschreibung des Saalkreises, Part II, p. 28). He must however have subsequently visited the University of Wittenberg, since we possess from him a Disputationem philosophicam, continentem ideam distinctam eorum, quae competunt vel menti vel corpori nostro vivo & organico, which he publicly defended aspraeses in Wittenberg on 29 May, 1734. In this dissertation he refers several times to another dissertation he defended, the Dissertatio de humana [sic] mentis apatheia.
From the Großes Universallexicon aller Wissenschaften und Künste, Leipzig, 1739-1750. Online version here.
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David-Henri Gallandat (1782):
While he [Gallandat] was on this voyage to Axim, on the Gold Coast of Africa, he went to visit the famous Herr Anton Wilhem Amo Guinea Afer, Doctor of Philosophy and Master of Liberal Arts. He was a Negro, who had spent around 30 years in Europe. He was in Amsterdam in 1707, and was bestowed to the Herzog of Braunschweig, Anton Ulrich, who gave him to his son, August Wilhelm. The latter sent him to study at Halle and in Wittenberg, where in 1727 he was promoted to Doctor of Philosophy and Master of Liberal Arts. Some time later his master died; this made him very melancholy, and he decided to return to his home country. He lived as a hermit, and was reputed to be a soothsayer. He spoke various languages- Hebrew, Greek, Latin, French, High and Low German, was very learned in astrology and astronomy, and was a great philosopher. At that time he was around 50 years old. His father and a sister were still alive, and lived a four days' journey inland. He had a brother who was a slave in the colony of Suriname. Later he moved from Axim and went to live in the fortress of the West Indian St. Sebastian Company, in Chama.
Terwyl hy op deeze reis te Axim op de Goudkunst in Africa was, ging hy den beroemden Heer Anthonius Guilielmus Amo Guinea Afer, Philosophiae Dr. et Artium Liberalium Magister bezoeken. Hy was een Neger, die ruim 30 Jaaren in Europa verkeerd had. Hy was in den Jaare 1707 in Amsterdam, en werd vereerd aan den Hertog van Brunswyk, Anthoni Ulrich, die hem aan zyn zoon Augustus Wilhelmus gaf. Deeze liet hem studeeren te Hall, en in Wittenberg, waar hy in den Jaare 1727 tot Doctor in de Philosophie en Meester in de Vrye konsten Gepromoveerd werd. Eenigen tyd daarna overleed zyn Meester: dit maakte hem zeer droefgeestig, en deed hum besluiten naar zyn Vaderland te rug te keeren; hy leefde daar toen als een Heremiet, en had den naam van een Gelukzegger te zyn; hy sprak verscheiden taalen, Hebreeuws, Grieks, Latyn, Fransch, Hoog- en Nederduitsch; was zeer kundig in de Astrologie en Astronomie, en een groot Wysgeer; zynde toen omtrent 50 Jaaren oud. Zyn Vader en eene Zuster leefden noch, en woonden vier dagreizen landwaard in; hy had een Broeder, die Slaaf was in de Colonie van Suriname; naderhand is hy van Axim verhuist en gaan woonen in de Fortres der West-Ind. Comp. St. Sebastiaan, te Chama.
--From Verhandelingen uitgegeven door het Zeeuwsch Genootschap der Wetenschappen te Vlissingen. Negende Deel. Middelburg, Pieter Gillissen, 1782, p. 19-20.
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Abbé Henri Grégoire (1808):
Amo (Antoine-Guillaume), born in Guinea, was brought at a very young age to Amsterdam, in 1707, and given to the duke of Braunschweig-Wolfenbüttel, Anton Ulrich, who gave him to his son August Wilhelm. The latter sent him to pursue his studies to the University of Halle, in Saxony, and to the University of Wittemberg. At the former, in 1729, under the chairmanship of the Chancellor von Ludwig, he defended a thesis, and published a dissertation On the Law of Moors.
Amo was versed in astronomy, and spoke Latin, Greek, Hebrew, French, Dutch, and German.
He so distinguished himself by his good morals and by his talents, that the rector and the council of the University of Wittemberg found it fitting, in 1733, to do him public honor through an epistle of congratulations. They recalled that Terence too was from Africa; that many martyrs, doctors, and church fathers were born in that same country, where letters flourished, and that fell back into barbarism when it lost Christianity.
Amo successfully gave individual courses, praised in the same epistle: in a program publiched by the dean of the faculty of philosophy, it is said of this learned Negro, that having treated of the systems of the ancients and the moderns, he selected and taught what was best in them.
Amo, having become a doctor, defended a thesis and published a dissertation in 1744 [sic] at Wittemberg on the sensations, considered as absent in the human soul, and present in the human body. In a letter written to him by the president, he is addressed as a vir nobilissime et clarissime; thus the University of Wittemberg did not have, on the basis of a difference of color, the prejudices of so many men who claim to be enlightened. The president states that he never made any changes to Amo's dissertation, since it was so well written. Indeed, the work bespeaks a mind that is well exercised in reflection. He seeks to establish the differences of phenomena between beings that exist without life, and those that have life. A stone exists, but is not alive.
It appears that abstract discussions held a particular attraction for our author, since, having become a professor, he saw to the defense, the same year, of a thesis that was similar to the preceding one, on the distinction that is to be made between the operations of the mind and those of the senses. The Berlin court conferred upon him the title of Councillor of State, but after the death of the prince of Braunschweig, his benefactor, Amo, having fallen into a deep melancholy, resolved to leave the Europe where he had lived for thirty years, and to return to his native land in Axim, on the Gold Coast. In 1753 he received the visit of the learned voyager and physician David-Henri Gallandat, who speaks of him in the Mémoires de l'Académie de Flessingue, of which he was a member.
Amo, at that time around 50 years old, led a solitary life there. His father and sister were still alive, and his brother was a slave in Suriname. Some time later, he left Axim, and settled in Chama, at the fort of the Dutch Saint-Sebastian Company.
I made some unfruitful research in order to discover whether Amo published other works, and when he died.
From De la littérature des Nègres, ou, recherches sur leurs facultés intellectueles, leurs qualités morales et leur littérature: suivies des notices sur la vie et les ouvrages des Nègres qui se sont distingués dans les sciences, les lettres et les arts, Paris, 1808, pgs. 198-202. Online version here.