In Salzburg, Fallmerayer found employment as a private tutor, and enrolled in a Benedictine seminary, where he studied classical, modern, and oriental philology, literature, history, and philosophy.
After a year's study he sought to assure to himself the peace and quiet necessary for a student's life by entering the abbey of Kremsmünster, but difficulties put in his way by the Bavarian officials prevented the accomplishment of this intention.
Two years of garrison life at Lindau on Lake Constance convinced him that his desire for military glory could not be fulfilled, and he devoted himself instead to the study of modern Greek, Persian and Turkish.
In February 1823 Fallmerayer learned of a prize offered by the Royal Danish Academy of Sciences and Letters to encourage research into the history of the Empire of Trebizond.
In 1827 the Geschichte des Kaisertums von Trapezunt was finally published, and met with universal praise from its reviewers, including Barthold Georg Niebuhr and Carl Hase.
[8] The first volume of Fallmerayer's Geschichte der Halbinsel Morea während des Mittelalters appeared in 1830, and he expressed his central theory in the foreword as follows: The race of the Hellenes has been wiped out in Europe.
Physical beauty, intellectual brilliance, innate harmony and simplicity, art, competition, city, village, the splendour of column and temple — indeed, even the name has disappeared from the surface of the Greek continent.... Not the slightest drop of undiluted Hellenic blood flows in the veins of the Christian population of present-day Greece.
[9] This phenomenon was further interpreted by Fallmerayer as an indication of the potential of the "Slavic" nations to overwhelm the "Latin" and the "German", a line of thought which he would later develop in his political writings.
He was accused of philological errors by the Slovenian linguist Jernej Kopitar, and of misreading the historical sources by the historians Johann Zinkeisen and Karl Hopf.
[14] Anthropologist Michael Herzfeld (2020) notes that "Whether judged by contemporary or present-day standards, Fallmerayer's scholarship is uneven at best and makes extensive use of special pleading and blank assertion".
In this article he stated that the sole fact that the inhabitants of Attica "did not speak Greek but Albanian", was sufficient reason for the Great Powers to choose the Turkish side in the Greek-Turkish conflict.
[19] Fallmerayer's theory was used as Nazi propaganda in Axis-occupied Greece (1941–1944) during World War II, when it was used as an excuse to commit numerous atrocities against the Greek population.
An opportunity presented itself when the Russian Count Alexander Ivanovich Ostermann-Tolstoy arrived in Munich, seeking a learned companion for an eastward journey.
The controversy had a pointedly political dimension, with Thiersch representing the "Idealpolitik" position, according to which Bavaria should support the Greek state, and Fallmerayer advocating a hands-off "Realpolitik."
This political polemic was further provoked by the preface to the second volume of Fallmerayer's Geschichte, published in 1836, in which he wrote that the Greek War of Independence was a "purely Shqiptarian (Albanian), not a Hellenic Revolution.
Fallmerayer soon after left the country again on account of political troubles, and spent the greater part of the next four years in travel, spending the winter of 1839–1840 with Count Tolstoy at Geneva.
Fallmerayer published numerous reports from this journey in the AZ, in which he offered a mix of political observations, restatements and further developments of the Greek theory, and "charming descriptions of Anatolian and Turkish landscapes [that] bear comparison with the best examples of 19th-century Reisebilder (travel images).
Instead of steady progress toward freedom, Fallmerayer perceived a fundamental polarity between "East" and "West": For nearly eighteen aeons [Äonen], all history has been the result of the struggle between two basic elements, split apart by a divine power from the very beginning: a flexible life-process on the one side, and a formless, undeveloped stasis on the other.
[26] Thiersch once more replied to these polemics in an article, also published in the AZ, arguing that the placement of western-European rulers on the thrones of the new Slavic states in the Balkans would be sufficient to prevent the rise of a "new Byzantine-Hellenic world empire.
By June he had arrived in Büyükdere, the summer residence of the Constantinople elite, where he remained for four months before travelling south to the Holy Land via Bursa and İzmir.
Fallmerayer's contributions to the AZ from this period emphasized the strength of Ottoman rule and reformist tendencies in the Turkish government, which he contrasted to the "desolate" condition of the Kingdom of Greece.
[32] Fallmerayer never offered a single class at the University, however, for on 25 April, before the beginning of the summer semester, he was chosen as a Bavarian delegate to the Frankfurt Parliament, a product of the Revolutions of 1848.
[34] As the parliamentary debates turned in August toward the relationship between church and state, Fallmerayer assumed an uncompromising anti-clerical stance, and his reputation among the left delegates increased.
[38] The Bavarian regime had forbidden its delegates to participate in the Stuttgart Parliament, and following its forcible break-up on June 18 by Württembergian troops, Fallmerayer fled to Switzerland.
[50] He is remembered as "a co-founder of Byzantine studies, as discoverer of the divisive Greek theory, as a prophet of the world-historical opposition between Occident and Orient, and finally as a brilliant essayist.
[55] Fallmerayer was one of three scholars (together with Gottlieb Lukas Friedrich Tafel and Georg Martin Thomas) who laid the foundation for Byzantinistik (Byzantine studies) as a self-sufficient academic discipline in Germany.
"[58] Early criticisms were published by the Slovene scholar Jernej Kopitar,[59] Friedrich Thiersch, Johann Wilhelm Zinkeisen,[60] George Finlay,[61] and Charles Alan Fyffe.
[63] On account of his insistence on the Slavic origin of the modern Greeks, Fallmerayer was considered a pan-Slavist by many in Greece, a characterization which in any case stood in opposition to his actual writings on contemporary politics.
[68] Fallmerayer's account of the split between "Occident" and "Orient" hinged on his interpretation of the Russian Empire, which he perceived as a powerful blend of Slavic ethnic characteristics, Byzantine political philosophy, and Orthodox theology.
[69] Fallmerayer's account of East and West represented a crucial break from Hegel's idealistic philosophy of history,[70] and has been characterized as a precursor to Samuel P. Huntington's "Clash of Civilizations" thesis.