Question: What is the meaning of the location once known as Persis?

full_context: Document 1: Iran: Iran is home to one of the world's oldest civilizations, beginning with the formation of the Proto-Elamite and Elamite kingdoms in 3200–2800 BC. The Iranian Medes unified the area into the first of many empires in 625 BC, after which it became the dominant cultural and political power in the region. Iran reached the pinnacle of its power during the Achaemenid Empire founded by Cyrus the Great in 550 BC, which at its greatest extent comprised major portions of the ancient world, stretching from parts of the Balkans (Thrace-Macedonia, Bulgaria-Paeonia) and Eastern Europe proper in the west, to the Indus Valley in the east, making it the largest empire the world had yet seen. The empire collapsed in 330 BC following the conquests of Alexander the Great. The Parthian Empire emerged from the ashes and was succeeded by the Sassanid Dynasty in 224 AD, under which Iran again became one of the leading powers in the world, along with the Roman-Byzantine Empire, for a period of more than four centuries.
Document 2: Islamic Azad University, Shahr-e-Rey Branch: The Islamic Azad University, Shahr-e-Rey Branch is situated in southern Tehran Province in Iran. It initially began working in Shahr Rey, the oldest part of Tehran.
Document 3: Iran: Tehran is the country's capital and largest city, as well as its leading cultural and economic center. Iran is a major regional and middle power, exerting considerable influence in international energy security and the world economy through its large reserves of fossil fuels, which include the largest natural gas supply in the world and the fourth-largest proven oil reserves. Iran's rich cultural legacy is reflected in part by its 19 UNESCO World Heritage Sites, the fourth-largest number in Asia and 12th-largest in the world.
Document 4: Iran: Iran (/aɪˈræn/ or i/ɪˈrɑːn/; Persian: Irān – ایران‎‎ [ʔiːˈɾɒːn] ( listen)), also known as Persia (/ˈpɜːrʒə/ or /ˈpɜːrʃə/), officially the Islamic Republic of Iran (جمهوری اسلامی ایران – Jomhuri ye Eslāmi ye Irān [d͡ʒomhuːˌɾije eslɒːˌmije ʔiːˈɾɒːn]), is a sovereign state in Western Asia. It is bordered to the northwest by Armenia, the de facto Nagorno-Karabakh Republic, and Azerbaijan; to the north by Kazakhstan and Russia across the Caspian Sea; to the northeast by Turkmenistan; to the east by Afghanistan and Pakistan; to the south by the Persian Gulf and the Gulf of Oman; and to the west by Turkey and Iraq. Comprising a land area of 1,648,195 km2 (636,372 sq mi), it is the second-largest country in the Middle East and the 18th-largest in the world. With 78.4 million inhabitants, Iran is the world's 17th-most-populous country. It is the only country that has both a Caspian Sea and an Indian Ocean coastline. Iran has long been of geostrategic importance because of its central location in Eurasia and Western Asia, and its proximity to the Strait of Hormuz.
Document 5: Shiraz: Shiraz has 71 bus lines with 50,000 buses. Iran's third Bus Rapid Transit opened in Shiraz in 2009 with two lines, and a further two planned to open in 2010. Service is free on 5 May, the day of the city.
Document 6: Iranian languages: Old Persian is the Old Iranian dialect as it was spoken in south-western Iran by the inhabitants of Parsa, who also gave their name to their region and language. Genuine Old Persian is best attested in one of the three languages of the Behistun inscription, composed circa 520 BC, and which is the last inscription (and only inscription of significant length) in which Old Persian is still grammatically correct. Later inscriptions are comparatively brief, and typically simply copies of words and phrases from earlier ones, often with grammatical errors, which suggests that by the 4th century BC the transition from Old Persian to Middle Persian was already far advanced, but efforts were still being made to retain an "old" quality for official proclamations.
Document 7: Iran: Historically, Iran has been referred to as Persia by the West, due mainly to the writings of Greek historians who called Iran Persis (Greek: Περσίς), meaning "land of the Persians." As the most extensive interactions the Ancient Greeks had with any outsider was with the Persians, the term persisted, even long after the Persian rule in Greece. However, Persis (Old Persian: Pārśa; Modern Persian: Pārse) was originally referred to a region settled by Persians in the west shore of Lake Urmia, in the 9th century BC. The settlement was then shifted to the southern end of the Zagros Mountains, and is today defined as Fars Province.
Document 8: History of Iran: The Persian Empire (Persian: شاهنشاهی ایران ‎, translit. Šâhanšâhiye Irân, lit. 'Imperial Iran') refers to any of a series of imperial dynasties that were centred in Persia / Iran from the 6th - century - BC Achaemenid Empire era to the 20th century AD in the Qajar dynasty era.
Document 9: Shiraz: Shiraz is the economic center of southern Iran. The second half of the 19th century witnessed certain economic developments that greatly changed the economy of Shiraz. The opening of the Suez Canal in 1869 allowed the extensive import into southern Iran of inexpensive European factory-made goods, either directly from Europe or via India. Farmers in unprecedented numbers began planting cash crops such as opium poppy, tobacco, and cotton. Many of these export crops passed through Shiraz on their way to the Persian Gulf. Iranian long-distance merchants from Fars developed marketing networks for these commodities, establishing trading houses in Bombay, Calcutta, Port Said, Istanbul and even Hong Kong.Shiraz's economic base is in its provincial products, which include grapes, citrus fruits, cotton and rice. Industries such as cement production, sugar, fertilizers, textile products, wood products, metalwork and rugs dominate. Shirāz also has a major oil refinery and is also a major center for Iran's electronic industries. 53% of Iran's electronic investment has been centered in Shiraz.
Document 10: Sivand Dam: Sivand Dam is a dam built in 2007 in Fars Province, Iran. Named after the nearby town of Sivand located northwest of Shiraz, it was the center of worldwide concern because of the flooding it would cause in historical and archaeologically rich areas of Ancient Persia and possible harm it may cause to the nearby UNESCO World Heritage Sites of Persepolis and Pasargadae.
Document 11: Firuzabad County: Firuzabad County () is a county in Fars Province in Iran. The capital of the county is Firuzabad. At the 2006 census, the county's population was 111,973, in 24,894 families. The county is subdivided into two districts: the Central District and Meymand District. The county has two cities: Firuzabad and Meymand.
Document 12: Delgosha Garden: Delgosha Garden is one of the historical gardens in Shiraz, Iran near Tomb of Sa’di and it belongs to the pre-Islamic era of the Sassanian Empire.
Document 13: Shiraz: Shiraz ( (listen); Persian: شیراز‎, Šīrāz, [ʃiːˈrɒːz] (listen)) is the fifth-most-populous city of Iran and the capital of Fars Province (Old Persian as Pars). At the 2016 census, the population of the city was 1,869,001 and its built-up area with "Shahr-e Jadid-e Sadra" (Sadra New Town) was home to 1,565,572 inhabitants. Shiraz is located in the southwest of Iran on the "Rudkhaneye Khoshk" (The Dry River) seasonal river. It has a moderate climate and has been a regional trade center for over a thousand years. Shiraz is one of the oldest cities of ancient Persia.
Document 14: Name of Iran: In the Western world, Persia (or one of its cognates) was historically the common name for Iran. On the Nowruz of 1935, Reza Shah Pahlavi asked foreign delegates to use the term Iran, the endonym of the country, in formal correspondence. Since then, in the Western World, the use of the word ``Iran ''has become more common. This also changed the usage of the terms for Iranian nationality, and the common adjective for citizens of Iran changed from`` Persian'' to ``Iranian ''. In 1959, the government of Mohammad Reza Shah Pahlavi, Reza Shah Pahlavi's son, announced that both`` Persia'' and ``Iran ''could officially be used interchangeably. However the issue is still debated today.
Document 15: Iran: Shiraz, with a population of around 1.4 million (2011 census), is the sixth major city of Iran. It is the capital of Fars Province, and was also a former capital of Iran. The area was greatly influenced by the Babylonian civilization, and after the emergence of the ancient Persians, soon came to be known as Persis. Persians were present in the region since the 9th century BC, and became rulers of a large empire under the reign of the Achaemenid Dynasty in the 6th century BC. The ruins of Persepolis and Pasargadae, two of the four capitals of the Achaemenid Empire, are located around the modern-day city of Shiraz.
ground_truth: Old Persian as Pars
sub_queries: What is Persis known as today? Answer: Fars Province
What does Fars Province mean? Answer: Old Persian as Pars