user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: what was the capital city of the east roman empire? 
Knowledge Triplets: Vatican City, location.location.containedby, Europe
Constantinople, location.location.events, Siege of Constantinople (1235)
Near East, common.topic.image, Near East
Byzantine Empire, location.location.containedby, Near East
Byzantine Empire, common.topic.article, m.03bwyzl
The History of the Decline and Fall of the Roman Empire, book.book.editions, The decline and fall of the roman empire
Near East, common.topic.notable_types, Literature Subject
Rome, base.biblioness.bibs_location.country, Italy
Byzantine Empire, location.location.people_born_here, Alypius
Near East, location.location.events, Sixth Crusade
The History of the Decline and Fall of the Roman Empire, book.book.editions, The Decline and Fall of the Roman Empire
Near East, book.book_subject.works, The Gold of Exodus
From Beirut to Jerusalem, book.written_work.subjects, Near East
Western Asia, location.location.contains, Near East
Theodosia of Constantinople, people.person.religion, Catholicism
Byzantine Empire, common.topic.notable_for, g.12595vddq
Roman–Persian Wars, base.culturalevent.event.entity_involved, Roman Empire
Vatican City, location.country.capital, Vatican City
Nikephoros I of Constantinople, common.topic.notable_for, g.125544yv7
Near East, common.topic.image, NearEast2
Byzantine Empire, location.location.people_born_here, Theophanes the Greek
Byzantium, royalty.kingdom.rulers, Alexios I Komnenos
Alexios I Komnenos, people.person.place_of_birth, Byzantine Empire
The History of the Decline and Fall of the Roman Empire, base.argumentmaps.expression_of_disvalue.thing_of_disputed_value, Christianity
The History of the Decline and Fall of the Roman Empire, book.book.editions, The history of the decline and fall of the Roman Empire.
Near East, location.location.contains, Ottoman Empire
Southern Europe, location.location.contains, Roman Republic
The History of the Decline and Fall of the Roman Empire, book.book.editions, The decline and fall of the Roman empire
Theodora Palaiologina, people.person.place_of_birth, Byzantine Empire
Autocracy, government.form_of_government.countries, Roman Empire
Asporça Hatun, people.person.place_of_birth, Byzantine Empire
Byzantine Empire, location.location.events, Rus'–Byzantine War
Siege of Constantinople, base.culturalevent.event.entity_involved, Constantine IV
Ottoman Empire, location.country.capital, Constantinople
Kingdom of Italy, location.country.capital, Rome
Coat-tails of empire, book.written_work.subjects, Near East
Byzantine conquest of Bulgaria, base.culturalevent.event.entity_involved, Roman of Bulgaria
The History of the Decline and Fall of the Roman Empire, book.written_work.subjects, Decline of the Roman Empire
Theodosia of Constantinople, people.person.place_of_birth, Byzantine Empire
Theodore Balsamon, people.person.place_of_birth, Byzantine Empire
The History of the Decline and Fall of the Roman Empire, book.written_work.subjects, Byzantine Empire
Byzantine Empire, location.location.events, Siege of Constantinople
The History of the Decline and Fall of the Roman Empire, common.topic.image, Edward Gibbon (1737–1794)
Arab–Byzantine wars, base.culturalevent.event.entity_involved, Byzantine Empire
Constantinople, location.location.events, Siege of Constantinople
Roman Republic, common.topic.notable_types, Country
University of Constantinople, common.topic.article, m.07ym5h
Occupation of Constantinople, common.topic.notable_types, Military Conflict
Roman of Bulgaria, common.topic.image, Roman BG
Byzantium, royalty.kingdom.rulers, Romanos I Lekapenos
Constantinople, common.topic.article, m.01q0x
Austrian Empire, location.location.containedby, Europe
Byzantium, royalty.kingdom.rulers, Alexander
Constantinople, location.location.events, Battle of Pegae
Near East, book.book_subject.works, Walking the Bible
Byzantine Empire, location.location.people_born_here, Nikephoros I
Battle of Skopje, base.culturalevent.event.entity_involved, Byzantine Empire
Absolute monarchy, government.form_of_government.countries, Roman Kingdom
Theodora Maria Kantakouzene, people.person.place_of_birth, Byzantine Empire
Communism And Nationalism In The Middle East, book.written_work.subjects, Near East
Roman–Persian Wars, time.event.locations, Anatolia
Roman of Bulgaria, people.person.gender, Male
Roman of Bulgaria, common.topic.article, m.066rmb
Roman of Bulgaria, people.deceased_person.place_of_death, Constantinople
Arab–Byzantine wars, base.culturalevent.event.entity_involved, Constantine V
The History of the Decline and Fall of the Roman Empire, book.book.editions, The decline and fall of the Roman Empire
Byzantine Empire, location.location.events, Massacre of the Latins
Byzantine Empire, location.location.events, Battle of Akroinon
University of Constantinople, location.location.containedby, Constantinople
Anatolia, location.location.containedby, Near East
Constantinople, location.location.events, Occupation of Constantinople
Byzantine Empire, book.book_subject.works, Christian chronicles and Byzantine history, 5th-6th centuries
Roman Empire, location.country.capital, Constantinople
Roman Empire, fictional_universe.fictional_setting.languages, Latin Language
University of Constantinople, location.location.containedby, Byzantine Empire
Near East, location.location.events, Operation Focus
Byzantine civil war of 1341–1347, base.culturalevent.event.entity_involved, Second Bulgarian Empire
The History of the Decline and Fall of the Roman Empire, book.written_work.subjects, World
Siege of Constantinople, common.topic.notable_for, g.125g6pg7b
Siege of Constantinople, base.culturalevent.event.entity_involved, Sergius I of Constantinople
Byzantium, royalty.kingdom.rulers, Michael IV the Paphlagonian
Constantinople, location.location.events, Byzantine civil war of 1373–79
Near East, book.book_subject.works, The life of my choice
Byzantine Empire, location.location.people_born_here, Maria-Irene Palaiologina
The Byzantine Empire, book.written_work.subjects, History
Siege of Constantinople, common.topic.image, Byzantine Constantinople eng
Near East, location.location.geolocation, m.0wn0b2k
Roman of Bulgaria, common.topic.notable_types, Noble person
Levant, location.location.containedby, Near East
Byzantine Empire, location.country.capital, Constantinople
Constantinople, common.topic.image, Byzantine Constantinople eng
Byzantine Empire, government.governmental_jurisdiction.government_bodies, Byzantine Senate
Byzantium, royalty.kingdom.rulers, Isaac Komnenos
Byzantine Empire, location.location.people_born_here, Joannes Actuarius
Roman–Persian Wars, base.culturalevent.event.entity_involved, Roman Republic
The Byzantine Empire, common.topic.notable_types, Book
Alypius, people.person.place_of_birth, Byzantine Empire
Italian Peninsula, location.location.partially_containedby, Vatican City
Seljuk Empire, common.topic.notable_types, Country
Constantine XI Palaiologos, people.person.nationality, Byzantine Empire
Eothen, or Traces of Travel, Brought Home from the East, book.written_work.subjects, Near East
Near East, common.topic.notable_for, g.125b9dqyq
Battle of the Gates of Trajan, base.culturalevent.event.entity_involved, Byzantine Empire
Nikephoros I of Constantinople, book.author.works_written, An eyewitness to history
Byzantine Empire, location.location.people_born_here, Kosara
Byzantine Empire, location.location.geolocation, m.0clpwn3
Roman Republic, location.country.capital, Rome
Byzantine civil war of 1373–79, base.culturalevent.event.entity_involved, Republic of Genoa
Byzantine–Sasanian War of 602–628, base.culturalevent.event.entity_involved, Byzantine Empire
Siege of Constantinople, common.topic.notable_for, g.125cb6y3v
Near East, location.location.events, Third Crusade
The History of the Decline and Fall of the Roman Empire, book.book.editions, The history of the decline and fall of the Roman Empire
Constantinople, location.location.events, Byzantine civil war of 1321–1328
Alexios Apokaukos, people.person.place_of_birth, Byzantine Empire
Near East, book.book_subject.works, Eothen, or Traces of Travel, Brought Home from the East
Byzantine conquest of Bulgaria, base.culturalevent.event.entity_involved, Bulgarian Empire
Edward Gibbon, book.author.book_editions_published, The History of the Decline and Fall of the Roman Empire
Western Asia, location.location.contains, Seljuk Empire
Saint Telemachus, people.deceased_person.place_of_death, Rome
Helena Kantakouzene, people.person.place_of_birth, Byzantine Empire
Byzantium, royalty.kingdom.rulers, Michael VII Doukas
Siege of Constantinople, base.culturalevent.event.entity_involved, Sasanian Empire
Constantinople, location.location.events, Battles of macrohistorical importance involving invasions of Europe
The History of the Decline and Fall of the Roman Empire, book.written_work.original_language, English Language
Byzantium, royalty.kingdom.rulers, Theodosius II
Siege of Adrianople, base.culturalevent.event.entity_involved, Byzantine Empire
Byzantium, royalty.kingdom.rulers, Constantine XI Palaiologos
The Seventh Great Oriental Monarchy, or, the Geography, History and Antiquities of the Sassanian or New Persian Empire, book.written_work.subjects, Near East
Vatican City, travel.tourist_attraction.near_travel_destination, Rome
Byzantine Empire, location.location.people_born_here, Alexios Apokaukos
Byzantine conquest of Bulgaria, time.event.locations, Bulgarian Empire
Italy, location.country.capital, Rome
Byzantine Empire, location.location.events, Battle of the Meander
The History of the Decline and Fall of the Roman Empire, book.book.editions, History of the decline and fall of the Roman Empire
Capital, type.property.expected_type, City/Town/Village
Near East, book.book_subject.works, The Seventh Great Oriental Monarchy, or, the Geography, History and Antiquities of the Sassanian or New Persian Empire
Rome, travel.travel_destination.tourist_attractions, Vatican City
Byzantine Empire, location.country.form_of_government, Autocracy
Roman Empire, location.country.capital, Rome
Vatican City, base.biblioness.bibs_location.city, Rome
Constantinople, location.location.events, Ottoman coups of 1807–08
Near East, location.location.contains, Seljuk Empire
From the Edge of the City, film.film.language, Greek Language
Battle of the Gates of Trajan, base.culturalevent.event.entity_involved, Basil II
Siege of Constantinople, common.topic.image, PriseDeConstantinople1204PalmaLeJeune
Roman of Bulgaria, people.person.parents, Irene Lekapene
Near East, book.book_subject.works, From an Antique Land
Vatican City, common.topic.notable_types, Country
Byzantine Empire, location.location.people_born_here, Asporça Hatun
Constantinople, location.location.contains, University of Constantinople
Istanbul, location.location.partially_containedby, Europe
Byzantium, royalty.kingdom.rulers, John I Tzimiskes
Constantinople, location.location.events, Battle of Constantinople
Constantine the Great, people.person.nationality, Roman Empire
Byzantine Empire, location.location.people_born_here, Smiltsena Palaiologina
Byzantium, symbols.namesake.named_after, Constantine the Great
Byzantine Empire, location.statistical_region.population, m.0n973xh
Capital, rdf-schema#range, City/Town/Village
Constantinople, location.location.events, Fall of Constantinople
Byzantine Empire, location.location.people_born_here, Theodosia of Constantinople
The History of the Decline and Fall of the Roman Empire, common.topic.article, m.07q96
Byzantine conquest of Bulgaria, time.event.locations, First Bulgarian Empire
First French Empire, location.country.form_of_government, Absolute monarchy
Byzantium, royalty.kingdom.rulers, John II Komnenos
Vatican City, base.biblioness.bibs_location.country, Italy
Byzantine Empire, location.location.containedby, Southern Europe
Edward Gibbon, book.author.book_editions_published, Decline and Fall of the Roman Empire, Vol. 3
Constantinople, common.topic.image, Byzantine Constantinople
The History of the Decline and Fall of the Roman Empire, book.written_work.subjects, Italy
Edward Gibbon, book.author.works_written, The History of the Decline and Fall of the Roman Empire
Roman Empire, common.topic.notable_types, Country
The History of the Decline and Fall of the Roman Empire, common.topic.notable_types, Book
Siege of Constantinople, common.topic.image, Leo III base gold solidus minted in Rome
The Byzantine Empire, book.written_work.subjects, Greece
Massacre of the Latins, time.event.locations, Byzantine Empire
Siege of Serdica, base.culturalevent.event.entity_involved, Byzantine Empire
First French Empire, location.location.containedby, Europe
Edward Gibbon, book.author.book_editions_published, The decline and fall of the roman empire
Near East, location.location.contains, Byzantine Empire
Byzantine conquest of Bulgaria, time.event.locations, Byzantine Empire
Greek Language, fictional_universe.fictional_language.where_spoken, Roman Empire
Edward Gibbon, book.author.book_editions_published, The Decline and Fall of the Roman Empire
The History of the Decline and Fall of the Roman Empire, book.written_work.author, Edward Gibbon
Nikephoros I of Constantinople, people.person.place_of_birth, Byzantine Empire
Byzantine Empire, location.country.form_of_government, Monarchy
Roman Miroshnichenko, people.person.gender, Male
Theodosia of Constantinople, common.topic.image, 00058 christ pantocrator mosaic hagia sophia 656x800
Near East, location.location.contains, Anatolia
Byzantine Empire, book.book_subject.works, The New Cambridge Medieval History, Vol. 5
The History of the Decline and Fall of the Roman Empire, book.book.editions, Decline & Fall of the Roman Empire (Wordsworth Classics of World Literature) (Wordsworth Classics of World Literature)
Byzantine civil war of 1373–79, base.culturalevent.event.entity_involved, Republic of Venice
Byzantine Empire, location.country.form_of_government, Absolute monarchy
Constantinople, location.location.contains, Great Palace of Constantinople
Byzantine Empire, location.location.events, Byzantine conquest of Bulgaria
Christianity, base.argumentmaps.thing_of_disputed_value.disparagement, The History of the Decline and Fall of the Roman Empire
Byzantium, royalty.kingdom.rulers, Isaac II Angelos
The History of the Decline and Fall of the Roman Empire, common.topic.notable_for, g.1257kps5w
Roman of Bulgaria, common.topic.notable_for, g.1259s0929
Near East, location.location.events, Ninth Crusade
Arab–Byzantine wars, base.culturalevent.event.entity_involved, Constantine IV
Near East, book.book_subject.works, Between war and peace
Byzantine Empire, government.governmental_jurisdiction.governing_officials, m.0nfmc30
Italian Peninsula, location.location.contains, Roman Kingdom
Near East, location.location.contains, Arminiya
Byzantine Empire, common.topic.image, Eastern Roman Empire
The History of the Decline and Fall of the Roman Empire, book.book.genre, Non-fiction
Siege of Constantinople, common.topic.article, m.04_1kxg
Byzantium, royalty.kingdom.rulers, Constans II
Byzantine Empire, location.location.people_born_here, Theodora Maria Kantakouzene
Constantinople, symbols.namesake.named_after, Constantine the Great
The Byzantine commonwealth, common.topic.notable_for, g.125dtpk91
Byzantium, royalty.kingdom.rulers, John VI Kantakouzenos
Roman of Bulgaria, people.person.parents, Peter I of Bulgaria
Near East, common.topic.image, Inhabitants of the Near East, late nineteenth century.
Roman Republic, location.country.official_language, Greek Language
Constantinople, location.location.events, Battle of Katasyrtai
The History of the Decline and Fall of the Roman Empire, book.written_work.subjects, History
The History of the Decline and Fall of the Roman Empire, base.schemastaging.context_name.pronunciation, g.125_qp33y
Roman–Persian Wars, time.event.locations, Palestine
Near East, book.book_subject.works, The Chatham House Version
Massacre of the Latins, time.event.locations, Constantinople
Vatican City, base.locations.countries.continent, Europe
Byzantine Empire, location.location.events, Battle of Gallipoli
Roman Republic, location.country.official_language, Latin Language
Kingdom of Hungary, location.location.containedby, Austrian Empire
Austrian Empire, location.location.contains, Kingdom of Hungary
Near East, book.book_subject.works, Communism And Nationalism In The Middle East
Palestine, location.location.containedby, Near East
Siege of Constantinople, time.event.locations, Constantinople
Byzantine Empire, base.schemastaging.context_name.pronunciation, g.125_l59rw
The Byzantine Empire, book.written_work.author, James A. Corrick
Vatican City, location.country.languages_spoken, English Language
First French Empire, common.topic.notable_types, Country
Eothen, or Traces of Travel, Brought Home from the East, book.written_work.subjects, History
Country, type.type.properties, Capital
Theodosia of Constantinople, common.topic.article, m.03d3tzv
Siege of Constantinople, time.event.included_in_event, Roman–Persian Wars
Campaigns of Suleiman the Magnificent, time.event.locations, Near East
Byzantium, royalty.kingdom.rulers, Michael IX Palaiologos
Byzantine Empire, location.location.events, Byzantine–Bulgarian wars
Byzantium, royalty.kingdom.rulers, Basil II
Roman–Persian Wars, time.event.includes_event, Siege of Constantinople
Seljuk Empire, location.location.containedby, Near East
The History of the Decline and Fall of the Roman Empire, book.book.editions, The History of the Decline and Fall of the Roman Empire
Southern Europe, location.location.contains, Republic of Venice
The History of the Decline and Fall of the Roman Empire, book.book.editions, Gibbon's History of the decline and fall of the Roman Empire, in six volumes, quarto, abridged in two volumes, octavo
Byzantine Empire, location.statistical_region.population, m.0n973x8
Byzantium, royalty.kingdom.rulers, Constantine V
Nikephoros I of Constantinople, common.topic.article, m.0bwgn
The Byzantine Empire, book.written_work.subjects, Civilization
Near East, location.location.events, Campaigns of Suleiman the Magnificent
Byzantine Empire, location.location.people_born_here, Theodora Palaiologina
Siege of Constantinople, base.culturalevent.event.entity_involved, Byzantine Empire
Constantinople, common.topic.notable_for, g.125cph80l
Battle of the Gates of Trajan, base.culturalevent.event.entity_involved, First Bulgarian Empire
Vatican City, location.country.form_of_government, Absolute monarchy
Coat-tails of empire, book.written_work.subjects, History
Byzantine Empire, location.location.people_born_here, Helena Kantakouzene
Near East, location.location.events, First Crusade
Near East, book.book_subject.works, From Beirut to Jerusalem
Edward Gibbon, book.author.book_editions_published, Decline & Fall of the Roman Empire (Wordsworth Classics of World Literature) (Wordsworth Classics of World Literature)
Byzantine civil war of 1373–79, time.event.locations, Constantinople
Constantinople, location.location.events, Massacre of the Latins
Byzantine Empire, location.country.official_language, Greek Language
Near East, common.topic.article, m.01ffby
Constantinople, location.location.containedby, Istanbul
Smiltsena Palaiologina, people.person.place_of_birth, Byzantine Empire
Roman–Persian Wars, base.culturalevent.event.entity_involved, Byzantine Empire
The History of the Decline and Fall of the Roman Empire, book.book.editions, The history of the decline & fall of the Roman empire
Byzantine Empire, location.country.official_language, Latin Language
Byzantine Empire, book.book_subject.works, The Trolley to Yesterday
Siege of Constantinople, time.event.locations, Byzantine Empire
Byzantine Empire, location.location.people_born_here, Nikephoros I of Constantinople
Byzantine Empire, location.location.people_born_here, Loukas Notaras
Byzantium, royalty.kingdom.rulers, Justinian II
Near East, book.book_subject.works, Hostage to History
The History of the Decline and Fall of the Roman Empire, book.book.editions, The history of the decline and fall of the Roman empire
Rome, location.location.containedby, Italy
Irene Lekapene, people.person.place_of_birth, Byzantine Empire
Constantinople, location.location.events, Battle of Kosmidion
The History of the Decline and Fall of the Roman Empire, book.written_work.subjects, Europe
Near East, location.location.contains, Palestine
Constantine XI Palaiologos, people.person.place_of_birth, Constantinople
Byzantine Empire, location.location.people_born_here, Irene Lekapene
The Byzantine commonwealth, book.book.editions, The Byzantine commonwealth; Eastern Europe, 500-1453
Constantinople, location.location.events, Rus'–Byzantine War
Eastern Roman Empire, common.image.appears_in_topic_gallery, Byzantine Empire
Byzantine Empire, location.location.people_born_here, Irene Palaiologina, Empress of Bulgaria
Roman–Persian Wars, base.culturalevent.event.entity_involved, Sasanian Empire
Seljuk Empire, location.country.form_of_government, Monarchy
Alexios I Komnenos, people.person.profession, Eastern Roman Emperor
Capital, rdf-schema#domain, Country
Byzantine conquest of Bulgaria, base.culturalevent.event.entity_involved, Byzantine Empire
Edward Gibbon, book.author.book_editions_published, The decline and fall of the Roman empire
Near East, book.book_subject.works, Peace Out of Reach
Eastern Roman Empire, common.image.size, m.02cbmbv
Byzantine Empire, location.location.people_born_here, Alexios I Komnenos
Constantine the Great, symbols.name_source.namesakes, Constantinople
Siege of Constantinople, time.event.included_in_event, Byzantine–Sasanian War of 602–628
Southern Europe, location.location.contains, Byzantine Empire
Byzantine Empire, book.book_subject.works, Byzantium - The Decline and Fall
Constantinople, location.location.geolocation, m.0ct0gnq
Byzantine civil war of 1341–1347, time.event.locations, Constantinople
Ottoman Empire, location.country.capital, Istanbul
Vatican City, location.location.partially_contains, Italian Peninsula
Seljuk Empire, location.location.containedby, Western Asia
Constantinople, location.location.events, Byzantine–Genoese War
Byzantium, royalty.kingdom.rulers, Nikephoros I
Near East, book.book_subject.works, Voyage en Orient
Republic of Venice, location.location.containedby, Southern Europe
Kingdom of Prussia, location.country.form_of_government, Absolute monarchy
Ottoman Empire, location.location.events, Occupation of the Ottoman Bank
Roman Miroshnichenko, freebase.valuenotation.is_reviewed, Country of nationality
The Byzantine commonwealth, book.book.editions, The Byzantine inheritance of Eastern Europe
Byzantine Empire, book.book_subject.works, The Byzantine Empire
Latin Language, fictional_universe.fictional_language.where_spoken, Roman Empire
Constantinople, location.location.events, g.120p54sm
Russian Empire, location.location.partially_containedby, Europe
Byzantine Empire, location.location.people_born_here, Roman of Bulgaria
Ottoman Empire, location.country.capital, Bursa
Constantine the Great, people.person.religion, Christianity
Ottoman Empire, location.location.containedby, Near East
Byzantine Empire, location.statistical_region.population, m.0h_4l07
Near East, book.book_subject.works, The long shadow
Constans II, royalty.monarch.kingdom, Byzantium
Roman of Bulgaria, people.person.place_of_birth, Byzantine Empire
Battle of Skopje, base.culturalevent.event.entity_involved, First Bulgarian Empire
Byzantium, royalty.kingdom.rulers, John III Doukas Vatatzes
Byzantium, royalty.kingdom.rulers, Theophilos
Edward Gibbon, book.author.book_editions_published, The history of the decline and fall of the Roman Empire
Byzantine Empire, location.statistical_region.population, m.0h_4l01
The Byzantine Empire, book.written_work.subjects, Byzantine Empire
Irene Palaiologina, Empress of Bulgaria, people.person.place_of_birth, Byzantine Empire
Siege of Constantinople, time.event.included_in_event, Arab–Byzantine wars
Constantinople, common.topic.notable_types, City/Town/Village
Roman Republic, location.location.containedby, Southern Europe
Sicily, location.location.events, Arab–Byzantine wars
Roman Empire, fictional_universe.fictional_setting.languages, Greek Language
From an Antique Land, book.written_work.subjects, Near East
The History of the Decline and Fall of the Roman Empire, book.written_work.subjects, History of Rome
Byzantine Empire, location.location.people_born_here, Theodore Balsamon
Nikephoros I of Constantinople, common.topic.image, Nicephorus sends an epistle to emperor Michael II in favour of the icons restoration Chronikon of Ioannis Skylitzes
Byzantine Empire, common.topic.image, LocationByzantineEmpire 550
Palestine, location.location.events, Roman–Persian Wars
Byzantine Empire, location.location.people_born_here, Constans II
Near East, location.location.containedby, Western Asia
Roman–Persian Wars, base.culturalevent.event.entity_involved, Kardarigan
LocationByzantineEmpire 550, common.image.appears_in_topic_gallery, Byzantine Empire
Siege of Constantinople, base.culturalevent.event.entity_involved, First Bulgarian Empire
Byzantine Empire, location.country.capital, Constantinople
Republic of Venice, common.topic.notable_types, Country
Roman Empire, location.country.form_of_government, Autocracy
The History of the Decline and Fall of the Roman Empire, book.written_work.subjects, Rome
The History of the Decline and Fall of the Roman Empire, book.book.editions, Decline and Fall of the Roman Empire, Vol. 3
Nikephoros I, people.person.place_of_birth, Byzantine Empire
Austrian Empire, common.topic.notable_types, Country
Near East, book.book_subject.works, The Hidden Hand: Middle East Fears of Conspiracy
Near East, book.book_subject.works, The Lure of the Mediterranean
Byzantine Empire, location.location.people_born_here, Pope Boniface IV
Theodosia of Constantinople, common.topic.notable_for, g.1258jbbcf
Eothen, or Traces of Travel, Brought Home from the East, common.topic.notable_types, Book
Capital, type.property.schema, Country
Roman–Persian Wars, base.culturalevent.event.entity_involved, Shahrbaraz
Byzantium, royalty.kingdom.rulers, Constantine III
Byzantine Empire, location.location.contains, University of Constantinople
Byzantine Empire, common.topic.notable_types, Country
Near East, book.book_subject.works, Coat-tails of empire
Constantinople, location.location.events, Occupation of the Ottoman Bank
Byzantium, royalty.kingdom.rulers, Constantine IV
Edward Gibbon, book.author.book_editions_published, Decline and Fall of the Roman Empire
Ottoman Empire, location.country.form_of_government, Absolute monarchy
The History of the Decline and Fall of the Roman Empire, book.written_work.subjects, Ancient Rome
The History of the Decline and Fall of the Roman Empire, common.topic.image, Edward Gibbon by Henry Walton cleaned
Occupation of Constantinople, time.event.locations, Constantinople
The History of the Decline and Fall of the Roman Empire, book.book.editions, Decline and Fall of the Roman Empire
The Byzantine Empire, common.topic.notable_for, g.12586wz_w
University of Constantinople, organization.organization.founders, Theodosius II
Near East, location.location.contains, Levant
The History of the Decline and Fall of the Roman Empire, book.book.editions, The History of the decline and fall of the Roman Empire
The History of the Decline and Fall of the Roman Empire, book.book.editions, Decline And Fall Of The Roman Empire, The
Siege of Constantinople, common.topic.article, m.09nl4m
Near East, book.book_subject.works, Three journeys in the Levant
Austrian Empire, location.country.form_of_government, Absolute monarchy
Constantinople, book.book_subject.works, Life on the Golden Horn
Byzantine Empire, book.book_subject.works, The Byzantine commonwealth
Hostage to History, book.written_work.subjects, Near East
From the Holy Mountain, book.written_work.subjects, Rome
Constantinople, location.location.events, Byzantine civil war of 1341–1347
Siege of Constantinople, common.topic.article, m.04zxq5j
Byzantine Empire, location.statistical_region.population, m.0h_4l0p
Ptolemaic Kingdom, location.location.containedby, Near East
Byzantine Empire, book.book_subject.works, Flavours of Byzantium
Byzantine Empire, book.book_subject.works, The History of the Decline and Fall of the Roman Empire
Edward Gibbon, book.author.book_editions_published, The decline and fall of the Roman Empire
Anatolia, location.location.events, Byzantine–Sasanian War of 602–628
Anatolia, location.location.events, Roman–Persian Wars
Byzantium, royalty.kingdom.rulers, Michael III
Near East, location.location.events, Six-Day War
m.0nfmc30, government.government_position_held.basic_title, Roman emperor
Byzantium, royalty.kingdom.rulers, Michael VIII Palaiologos
Siege of Varna, base.culturalevent.event.entity_involved, Byzantine Empire
Roman emperor, government.government_office_category.officeholders, m.0nfmc30
Near East, book.book_subject.works, The blood of Abraham
Byzantine Empire, location.location.people_born_here, Saint Telemachus
Roman Miroshnichenko, freebase.valuenotation.is_reviewed, Date of birth
Byzantine Empire, book.book_subject.works, History of the Lombards
Siege of Constantinople, common.topic.article, m.03c3_cz
Constans II, people.person.place_of_birth, Byzantine Empire
Eothen, or Traces of Travel, Brought Home from the East, book.book.genre, Fiction
Roman Empire, location.country.official_language, Latin Language
Byzantine Empire, book.book_subject.works, Count Belisarius
Occupation of Constantinople, base.culturalevent.event.entity_involved, Kingdom of Italy
Near East, location.location.contains, Ptolemaic Kingdom
Siege of Constantinople, common.topic.notable_for, g.125ck6zjw
The Byzantine commonwealth, book.written_work.subjects, Byzantine Empire
Anatolia, location.location.events, Arab–Byzantine wars
Edward Gibbon, book.author.book_editions_published, Decline And Fall Of The Roman Empire, The
Cimbrian War, base.culturalevent.event.entity_involved, Roman Republic
Byzantine Empire, common.topic.article, m.017d5
Kosara, people.person.place_of_birth, Byzantine Empire
Near East, location.location.events, Middle Eastern theatre of World War I

Answer: Constantinople