Question: Castra of Izbășești was made in this province that was the largest territorial and administrative unit of the empire's territorial possessions outside of Italy until what year

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Alexandre de Gusmão: Alexandre de Gusmão (Santos, 17 July 1695 – Lisbon, 9 May 1753) was a diplomat born in the Portuguese colony of Brazil.  He is regarded as one of the best diplomats of his time, chiefly for his role in negotiating the Treaty of Madrid in 1750 (revoked in 1761), when Portugal and Spain were attempting to delimit their territorial possessions in South America and Asia.  Born in the city of Santos, he may be considered one of the precursors of the application of the principles of Illuminism to international relations, adopting the principle of "uti possidetis", according to which each state has the right to the land that it actually occupies, as well as the idea of "natural boundaries", which suggests the use of prominent geographical accidents – such as rivers and mountain ranges – to set the limits between states.  He graduated in Law and was the representative of Portugal to various states, among which Rome, where he came to be invited to join Pope Innocent XIII's court.  He was also a brother of Bartolomeu de Gusmão, a priest and naturalist recalled for his early work on lighter-than-air airship design (balloons).

James Alexander Robertson: James Alexander Robertson (August 19, 1873 – March 20, 1939) was an American academic historian, archivist, translator and bibliographer.  He is most noted for his contributions to the history and historiography of the Philippines and other former territorial possessions of the Viceroyalty of New Spain.

List of possessions of Norway: This is a list of current and former territorial possessions of Norway.

Province: A province is almost always an administrative division, within a country or state.  The term derives from the ancient Roman "provincia", which was the major territorial and administrative unit of the Roman Empire's territorial possessions outside Italy.  The term province has since been adopted by many countries, and in those with no actual provinces, it has come to mean "outside the capital city".  While some provinces were produced artificially by colonial powers, others were formed around local groups with their own ethnic identities.  Many have their own powers independent of federal authority, especially in Canada.  In other countries, like China, provinces are the creation of central government, with very little autonomy.

Castra of Izbășești: The Castra of Izbășești was a fort made of earth in the Roman province of Dacia.  Erected and abandoned at an uncertain date, the fort was part of the "Limes Transalutanus".  Traces of the one time earthwork can be identified on the Corbeasca Hill at Izbășești (commune Stolnici, Romania).

Korochansky Uyezd: Korochansky County became an administrative unit in the mid-1600s.  Korochansky county was part of the nearby settlements of the Belgorod defensive line.  Korochansky county was formally abolished as an administrative unit in 1708 during the regional reforms of Peter the Great.  Korocha became part of Kiev Governorate.  In 1719, the province was divided, and became part of the Belgorod Governorate of Kiev Governorate.  In 1727, Beglrod province, consisting of Belgorod, Orel and Sevsk provinces was allocated.  Korochansky county was restored as part of the Belgorod Province.  In 1779, as a result of the reforms of Catherine the Great, the Belgorod Province was abolished.  Korochansky Uyezd's boundaries were revised and it became part of Kursk Governorship.  In 1796, Kursk Governorship became the Kursk Governorate.  Part of the territory in Stary Oskol Uyezd became part of Korochansky Uyezd, but parts of Korochansky Uyezd became part of Novoskolsky Uyezd.  In 1802, the borders were again revised.  In 1918, parts of the uyezd were occupied by German troops.  On 12 May 1924, the county was officially abolished and it became part of the Belgorod Uyezd.

Autonomous territorial unit: An Autonomous territorial unit or territorial autonomous unit (Romanian: "Unitate teritorială autonomă" ) is an administrative division of Moldova.  Gagauzia is the only such unit.  Moldovan law also recognizes the Transnistria autonomous territorial unit with special legal status.  De facto it is a self-proclaimed statelet operating outside the jurisdiction of the government as the Pridnestrovian Moldavian Republic.

Bandon (Byzantine Empire): The bandon (Greek: βάνδον ) was the basic military and territorial administrative unit of the middle Byzantine Empire.  Its name, like the Latin "bandus" and "bandum" ("ensign, banner"), had a Germanic origin.  It derived from the Gothic "bandwō", which is the witness of foreign influence in the army at the time this type of unit evolved.  The term was used already in the 6th century, mentioned by Procopius, as a term for a battle standard, and soon came to be applied to the unit bearing such a standard itself.  Since the time of ruling Nikephoros I (802–811) it was the name for a subdistrict of the Byzantine "thema".

Byzantine Empire under the Justinian dynasty: The Byzantine Empire had its first golden age under the Justinian Dynasty, which began in 518 AD with the Accession of Justin I.  Under the Justinian Dynasty, particularly the reign of Justinian I, the Empire reached its largest territorial point, reincorporating North Africa, southern Illyria, southern Spain, and Italy into the Empire.  The Justinian Dynasty ended in 602 with the deposition of Maurice and the ascension of his successor, Phocas.

Roman province: In Ancient Rome, a province (Latin: "provincia", pl.  "provinciae") was the basic, and, until the Tetrarchy (293 AD), largest territorial and administrative unit of the empire's territorial possessions outside of Italy.  The word "province" in modern English has its origins in the term used by the Romans.

Supporting paragraphs: Castra of Izbășești Roman province
Answer: 293 AD