Please answer the following question: Information: - Razlog is a town and ski resort in Razlog Municipality, Blagoevgrad Province in southwestern Bulgaria. It is situated in the Razlog Valley and was first mentioned during the reign of Byzantine emperor Basil II. During his 18941896 trip in the region of Macedonia, Bulgarian geographer Vasil Kanchov visited Razlog (then known as , "Mehomiya") and reported that it numbered 820 households, of which 500 of Eastern Orthodox Bulgarians, 300 of Muslim Bulgarians (Pomaks), 16 of Protestant Bulgarians and 5 of Eastern Orthodox Aromanians, for a total population of around 4,620. According to the same author's 1900 study on the population of Macedonia, Razlog was populated by 4,970 people, of which 3,200 Christian Bulgarians, 1,460 Muslim Bulgarians, 80 Turks, 200 Romani and 30 Aromanians. - Pomaks is a term used for Slavic Muslims inhabiting Bulgaria, northeastern Greece and northwestern Turkey, mainly referring to the ca. 220,000 strong confessional minority in Bulgaria known officially as Bulgarian Muslims. The term has also been used as a wider designation, including also the Slavic Muslim populations of the Republic of Macedonia and Albania. The Bulgarian dialect spoken by the Pomaks in Greece and Turkey, is referred there as the Pomak language. The community in Greece is commonly fluent in Greek, and in Turkey, Turkish, while the communities in these two countries, especially in Turkey, are increasingly adopting Turkish as their first language as a result of education and family links with the Turkish people. The origin of the Pomaks has been debated; but usually they are considered descendants of native Bulgarians, who converted to Islam during the Ottoman rule of the Balkans. - Zorka Petrova Parvanova ( Bulgarian : ) ( born 4 May 1958 in Razlog ) is the wife of Georgi Parvanov the former President of Bulgaria . - Bulgaria (tr. '), officially the Republic of Bulgaria (tr. '), is a country in southeastern Europe. It is bordered by Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, and the Black Sea to the east. With a territory of , Bulgaria is Europe's 16th-largest country. - Georgi Sedefchov Parvanov (born 28 June 1957) is a Bulgarian historian and politician who was President of Bulgaria from 2002 to 2012. He was elected after defeating the incumbent Petar Stoyanov in the second round of the November 2001 presidential election, and he took office on 22 January 2002. He was reelected in a landslide victory in 2006, becoming the first Bulgarian president to serve two terms. Parvanov was a supporter of Bulgaria's membership in NATO and the European Union. - Petar Stefanov Stoyanov (born 25 May 1952) is a Bulgarian politician who was President of Bulgaria from 1997 to 2002. He was elected as a candidate of the Union of Democratic Forces (UDF). He did not succeed in the next presidential elections and after leaving office refrained from politics for a while, but, later became an MP in 2005 and was Chairman of UDF from October 1, 2005 to May 22, 2007. - Serbia, officially the Republic of Serbia, is a sovereign state situated at the crossroads of Central and Southeast Europe, covering the southern part of the Pannonian Plain and the central Balkans. Relative to its small territory, it is a diverse country distinguished by a "transitional" character, situated along cultural, geographic, climatic and other boundaries. Serbia is landlocked and borders Hungary to the north; Romania and Bulgaria to the east; Macedonia to the south; and Croatia, Bosnia-Herzegovina, and Montenegro to the southwest; it also claims a border with Albania through the disputed territory of Kosovo. Serbia numbers around 7 million residents, and its capital, Belgrade, ranks among the largest cities in Southeast Europe. - The North Atlantic Treaty Organization (NATO '), also called the North Atlantic Alliance, is an intergovernmental military alliance based on the North Atlantic Treaty which was signed on 4April 1949. The organization constitutes a system of collective defence whereby its member states agree to mutual defence in response to an attack by any external party. Three NATO members are permanent members of the United Nations Security Council with the power to veto and are officially nuclear-weapon states: the United States, France and the United Kingdom. NATO's headquarters are located in Haren, Brussels, Belgium, where the Supreme Allied Commander also resides. Belgium is one of the 28 member states across North America and Europe, the newest of which, Albania and Croatia, joined in April 2009. An additional 22countries participate in NATO's Partnership for Peace program, with 15other countries involved in institutionalized dialogue programmes. The combined military spending of all NATO members constitutes over 70% of the global total. Members' defence spending is supposed to amount to 2% of GDP. - The Black Sea is a body of water between Eastern Europe and Western Asia, bounded by Bulgaria, Georgia, Romania, Russia, Turkey, and Ukraine. It is supplied by a number of major rivers, such as the Danube, Dnieper, Rioni, Southern Bug, and Dniester. The Black Sea has an area of (not including the Sea of Azov), a maximum depth of , and a volume of . It is constrained by the Pontic Mountains to the south and by the Caucasus Mountains to the east, and features a wide shelf to the northwest. The longest east-west extent is about . - Vasil Kanchov ("Vasil Knov") (26 July 1862 6 February 1902) was a Bulgarian geographer, ethnographer and politician. - BasilII ("BasileiosII"; 958 15 December 1025) was a Byzantine Emperor from the Macedonian dynasty who reigned from 10 January 976 to 15 December 1025. He was known in his time as Basil the Porphyrogenitus and Basil the Young to distinguish him from his supposed ancestor, BasilI the Macedonian. - Romania is a sovereign state located in Southeastern Europe. It borders the Black Sea, Bulgaria, Ukraine, Hungary, Serbia, and Moldova. It has an area of and a temperate-continental climate. With 19.94 million inhabitants, the country is the seventh-most-populous member state of the European Union. The capital and largest city, Bucharest, with its 1,883,425 inhabitants is the sixth-largest city in the EU. - The European Union (EU) is a political and economic union of member states that are located primarily in Europe. It has an area of , and an estimated population of over 510 million. The EU has developed an internal single market through a standardised system of laws that apply in all member states. EU policies aim to ensure the free movement of people, goods, services, and capital within the internal market, enact legislation in justice and home affairs, and maintain common policies on trade, agriculture, fisheries, and regional development. Within the Schengen Area, passport controls have been abolished. A monetary union was established in 1999 and came into full force in 2002, and is composed of 19 EU member states which use the euro currency. Given the paragraphs above, decide what entity has the relation 'occupation' with 'historian'.
A:
zorka parvanova