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Third Rome is the hypothetical successor of the Roman Empire or Byzantine Empire, legal or otherwise. The Second Rome is generally considered as being the Byzantine Empire, also known as the Eastern Roman Empire. Many countries have claimed their legal succession after the Fall of Constantinople.
Known as a theological and a political concept "Moscow is the Third Rome", it was formulated in the 15th-16th centuries in the Grand Duchy of Moscow. In the concept there could be traced three interrelated and interpenetrating fields of ideas: a) theology that is linked with justification of necessity and inevitability in unity of Eastern Orthodox Church; b) social politics that are derived out of the feeling of unity in East Slavic territories being historically tied through Christian Orthodox faith and Slavic culture; c) state doctrine, according to which the Moscow Prince should act as a supreme sovereign (Sovereign and legislator) of Christian Orthodox nations and become a defender of the Christian Orthodox Church. Herewith the Church should facilitate the Sovereign in execution of his function supposedly determined by God, the autocratic administration.
After the fall of T?rnovo to the Ottoman Turks in 1393, a number of Bulgarian clergymen sought shelter in the Russian lands and transferred the idea of the Third Rome there, which eventually resurfaced in Tver, during the reign of Boris of Tver, when the monk Foma (Thomas) of Tver had written The Eulogy of the Pious Grand Prince Boris Alexandrovich in 1453.
Within decades after the capture of Constantinople by Mehmed II of the Ottoman Empire on 29 May 1453, some Eastern Orthodox people were nominating Moscow as the "Third Rome", or the "New Rome". Stirrings of this sentiment began during the reign of Ivan III of Russia, who styled himself Czar (cf. Caesar), who had married Sophia Paleologue. Sophia was a niece of Constantine XI, the last Byzantine emperor. By the rules and laws of inheritance followed by most European monarchies of the time, Ivan could claim that he and his offspring were heirs of the fallen Empire, but the Roman traditions of the empire had never recognized automatic inheritance of the Imperial office. It was also Sophia's brother, Andreas Palaiologos, who held the rights of succession to the Byzantine throne. Andreas died in 1502, having sold his titles and royal and imperial rights to Ferdinand II of Aragon and Isabella I of Castile. A stronger claim was based on religious symbolism. The Orthodox faith was central to Byzantine notions of their identity and what distinguished them from "barbarians". Vladimir the Great had converted Kievan Rus' to Orthodoxy in 988, in return for which he became the first barbarian to ever get an Imperial princess as a wife.
The idea of Muscovy as heir to Rome crystallized with a panegyric letter composed by the Russian monk Philotheus (Filofey) of Pskov in 1510 to their son Grand Duke Vasili III, which proclaimed, "Two Romes have fallen. The third stands. And there will be no fourth. No one shall replace your Christian Tsardom!" Contrary to the common misconception, Filofey explicitly identifies Third Rome with Muscovy (the country) rather than with Moscow (the city), although the term "Muscovy" was considered synonymous with the Russian lands at the time. Somewhat notably, Moscow is placed on seven hills, as were Rome and Constantinople.
Shortly before Joseph II inherited the States of the House of Austria, he traveled to Russia in 1780. In her conversations with him Catherine II made it clear that she would renew the Byzantine empire and to use her one-year-old grandson Konstantin as Emperor of Constantinople. The guest tried to suggest to the guest that he could be held harmless in the Papal States.
The Sultanate of Rûm established in the parts of Anatolia which had been conquered from the Byzantine Empire by the Seljuk Empire.
After the fall of Constantinople in 1453 AD, Mehmed II declared himself Kayser-i Rum, literally "Caesar of Rome". The claim was recognized by the Orthodox Patriarch of Constantinople, but not by the Roman Catholic Western Europe. Gennadios (Georgios Scholarios), a staunch enemy of the West, had been enthroned Patriarch of Constantinople with all the ceremonial attributes of Byzantium by Mehmed himself acting as Roman Emperor and in turn Gennadios recognized Mehmed as successor to the throne. Mehmed's claim rested with the concept that Constantinople was the seat of the Roman Empire, after the transfer of its capital to Constantinople in 330 AD and the fall of the Western Roman Empire. Mehmed also had a blood lineage to the Byzantine Imperial family; his predecessor, Sultan Orhan I had married a Byzantine princess, and Mehmed may have claimed descent from John Tzelepes Komnenos. During that period the Ottoman Empire also destroyed Otranto and its people, and Mehmed II was planning on taking Rome itself when the Italian campaign was cut short by his sudden death. The title fell into disuse after his death, but the imperial bodies created by Mehmed II lived on for centuries to come.
The term appeared for the first time during the debates of Prime Minister Ioannis Kolettis with King Otto that preceded the promulgation of the 1844 constitution. This was a visionary nationalist aspiration that was to dominate foreign relations and, to a significant extent, determine domestic politics of the Greek state for much of the first century of independence. The expression was new in 1844 but the concept had roots in the Greek popular psyche. It long had hopes of liberation from Turkish rule and restoration of the Byzantine Empire.
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(Once more, as years and time go by, once more they shall be ours).
The Megali Idea implied the goal of reviving the Eastern Roman (Byzantine) Empire, by establishing a Greek state, which would be, as ancient geographer Strabo wrote, a Greek world encompassing mostly the former Byzantine lands from the Ionian Sea to the west, to Asia Minor and the Black Sea to the east and from Thrace, Macedonia and Epirus to the north, to Crete and Cyprus to the south. This new state would have Constantinople as its capital: it would be the "Greece of Two Continents and Five Seas" (Europe and Asia, the Ionian, Aegean, Marmara, Black and Libyan seas, respectively).
In 913, Simeon I of Bulgaria was crowned Emperor (Tsar) by the Patriarch of Constantinople and imperial regent Nicholas Mystikos outside of the Byzantine capital. In its final simplified form, the title read "Emperor and Autocrat of all Bulgarians and Romans" (Car i samod?r?ec na vsi?ki b?lgari i g?rci in the modern vernacular). The Roman component in the Bulgarian imperial title indicated both rulership over Greek speakers and the derivation of the imperial tradition from the Romans, however this component was never recognised by the Byzantine court.
Byzantine recognition of Simeon's imperial title was revoked by the succeeding Byzantine government. The decade 914-924 was spent in destructive warfare between Byzantium and Bulgaria over this and other matters of conflict. The Bulgarian monarch, who had further irritated his Byzantine counterpart by claiming the title "Emperor of the Romans" (basileus t?n R?mai?n), was eventually recognized, as "Emperor of the Bulgarians" (basileus t?n Boulgar?n) by the Byzantine Emperor Romanos I Lakapenos in 924. Byzantine recognition of the imperial dignity of the Bulgarian monarch and the patriarchal dignity of the Bulgarian patriarch was again confirmed at the conclusion of permanent peace and a Bulgarian-Byzantine dynastic marriage in 927. In the meantime, the Bulgarian imperial title may have been also confirmed by the pope. The Bulgarian imperial title "tsar" was adopted by all Bulgarian monarchs up to the fall of Bulgaria under Ottoman rule. 14th-century Bulgarian literary compositions clearly denote the Bulgarian capital (Tarnovo) as a successor of Rome and Constantinople, in effect, the "Third Rome".
The claimant Eastern Roman Emperor Andreas Palaiologos ceded the Roman Imperial crown to Ferdinand II of Aragon and Isabella I of Castile in his last will dated April 7, 1502. Many cities and institutions in the Kingdom of Spain to this day use the double-headed Roman eagle. The city of Toledo, province of Toledo and the province of Zamora are just few of many examples.
The Latin Empire (official Empire of Romania) was a Crusader state founded after the Fourth Crusade on lands captured and usurped the imperial throne from the Byzantine Empire. The Latin Empire was intended to supplant the Byzantine Empire as the titular Roman Empire in the east, with a Western Roman Catholic emperor enthroned in place of the Eastern Orthodox Roman emperors. James of Baux willed his titular claims to Duke Louis I of Anjou, also claimant to the throne of Naples, but Louis and his descendants (including the Holy Roman Emperor from the House of Habsburg-Lorraine and the Austrian emperors through Francis I) never used the title.
The Carolingian Empire has been claimed to have deliberately sought to revive the Roman Empire in the West. According to early German nationalism, the Carolingian Empire transformed into the Holy Roman Empire as a continuation of the Western Roman Empire. In 800, the title of Emperor of the Romans was granted to Charlemagne by Pope Leo III. The word "holy" (often retroactively applied to all emperors since Charlemagne) was added under the reign of emperor Frederick I Barbarossa in 1157.
Later the German Empire in 1871 also claimed to be the Third Rome, also through lineage of the HRE. The title for emperors of the Holy Roman Empire, the Austrian Empire and the German Empire was Kaiser (derived from Latin Caesar), the German word for emperor.
Claims by the German Empire of 1871 to 1918 of being a "Third Rome" have been criticized because the German Empire was led by a Protestant ruler and no concordat had been achieved with the Catholic Church, which was a major driver of Roman expansionism in the West. 
Nazi Germany used the term Drittes Reich (meaning "Third Realm" or "Third Empire"), as successor of the first realm (HRE) and the second realm (the German Empire). In 1939, however, in a circular not intended for publication, further use of the term "Third Reich" was prohibited.
After the Holy Roman Empire was dismantled in 1806, the Austrian Empire sought to lay claim as the heir of the Holy Roman Empire as Austria's Habsburgs attempted to unite Germany under their rule.
The Federal State of Austria used some symbols from the Holy Roman Empire and the Austrian Empire:
The Cross potent, symbol of the Fatherland Front, was as medieval symbol - the oldest representation is on the (German) Imperial Sword (one of the four most important parts of the Imperial Regalia of the HRE). The consistent use of this propaganda symbol was new to Austria.
In contrast to the one-headed, graphically strictly designed eagle of the German Reich, the eagle of the estates state leaned against the two-headed Quaternionenadler of the Holy Roman Empire. Since Old Austria had led the double eagle for centuries, since the Habsburgs became Holy Roman Emperor, the return to it seemed nostalgic. The traditional care with elements of imperial Austria, the admission of aristocratic titles and the partial reversal of the Habsburg Law fit in with this.
The Austrian Armed Forces received in 1934 (with the exception of the small air forces) instead of the previously worn comparatively modern uniforms in the style of the Reichswehr such in the manner of the Danube monarchy.
In four campaigns, Napoleon transformed his "Carolingian" feudal and federal empire into one modelled on the Roman Empire. The memories of imperial Rome were for a third time, after Julius Caesar and Charlemagne, used to modify the historical evolution of France. Though the vague plan for an invasion of Great Britain was never executed, the Battle of Ulm and the Battle of Austerlitz overshadowed the defeat of Trafalgar, and the camp at Boulogne put at Napoleon's disposal the best military resources he had commanded, in the form of La Grande Armée.
When Napoleon proclaimed himself Emperor of France, he also called his own imperial crown the "Crown of Charlemagne".
Desperate for money, Andreas Palaiologos sold the rights to the Byzantine crown which he possessed since the death of his father. Charles VIII of France purchased the rights of succession from Andreas during 1494 and died on April 7, 1498. The following Kings of France continued the claim and used the Imperial titles and honors: Louis XII, Francis I, Henry II and Francis II. Not until Charles IX in 1566 did the imperial claim come to an eventual end through the rules of extinctive prescription as a direct result of desuetude or lack of use. Charles IX wrote that the imperial Byzantine title "is not more eminent than that of king, which sounds better and sweeter."
Giuseppe Mazzini, Italian nationalist and patriot, promoted the notion of the "Third Rome" during the Risorgimento. He said, "After the Rome of the emperors, after the Rome of the Popes, there will come the Rome of the people", addressing Italian unification and the establishment of Rome as the capital. After the unification of Italy into the Kingdom of Italy, the state was referred to as the Third Rome by Italian figures.
After the unification, Mazzini spoke of the need of Italy as a Third Rome to have imperial aspirations. Mazzini said that Italy should "invade and colonize Tunisian lands" as it was the "key to the Central Mediterranean", and he viewed Italy as having the right to dominate the Mediterranean Sea as ancient Rome had done.
In his speeches, Italian dictator Benito Mussolini referred to his Fascist Italy as a "Third Rome" or as a New Roman Empire.Terza Roma (Third Rome; the Fascist Rome after the Imperial and the Papal ones) was also a name for Mussolini's plan to expand Rome towards Ostia and the sea. The EUR neighbourhood was the first step in that direction.
The concept of a "Third Rome" figures greatly in the second memoir of Whittaker Chambers. Although published posthumously as Cold Friday (1964), Chambers had planned it from inception as "The Third Rome". A long chapter called "The Third Rome" appears in the memoir.
In the 1997 film, The Saint, the villain, Russian oil magnate Ivan Tretiak, publishes a book titled The Third Rome.