Khazar in the context of "Polyglot"

Kievan Rus', also known as Kyivan Rus', was the first East Slavic state and later an amalgam of principalities in Eastern Europe from the late 9th to the mid-13th century. Encompassing a variety of polities and peoples, including East Slavic, Norse, and Finnic, it was ruled by the Rurik dynasty, founded by the Varangian prince Rurik. The name was coined by Russian historians in the 19th century to describe the period when Kiev was preeminent. At its greatest extent in the mid-11th century, Kievan Rus' stretched from the White Sea in the north to the Black Sea in the south and from the headwaters of the Vistula in the west to the Taman Peninsula in the east, uniting the East Slavic tribes.

According to the Primary Chronicle, the first ruler to unite East Slavic lands into what would become Kievan Rus' was Varangian prince Oleg the Wise (r. 879–912). He extended his control from Novgorod south along the Dnieper river valley to protect trade from Khazar incursions from the east, and took control of the city of Kiev, laying the foundation of the state and becoming prince of Kiev. Sviatoslav I (r. 943–972) achieved the first major territorial expansion of the state, fighting a war of conquest against the Khazars. Vladimir the Great (r. 980–1015) spread Christianity with his own baptism and, by decree, extended it to all inhabitants of Kiev and beyond. Kievan Rus' reached its greatest extent under Yaroslav the Wise (r. 1019–1054); his sons assembled and issued its first written legal code, the Russkaya Pravda, shortly after his death.

The Palóc [ˈpɒloːt͡s] are a subgroup of Hungarians in Northern Hungary and southern Slovakia. While the Palóc have retained distinctive traditions, including a very divergent dialect of Hungarian, the Palóc are also ethnic Hungarians by general consensus. Although their origins are unclear, the Palóc seem to have some sort of connections with the Khazar, Kabar, Pechenegs, Cuman and especially with the Avar tribes. The writings of Kálmán Mikszáth gave new prominence to the people in 1882 with his work The Good People of Palóc. The Palóc village of Hollókő was proclaimed a UNESCO World Heritage Site in 1987 because of its preservation of traditional Palóc architecture and land use. Two branches of the Palócs can be distinguished based on their place of residence and customs: the western and the eastern (Barkó) Palócs, although the folk customs of both branches are mixed with remnants of ancient inner Asian beliefs and Christianity. They can be further grouped based on their dialect. The residence of the Palócs extends to the often-mentioned Palócföld (Palócland), which used to belong to Hont and Gömör and Kishont counties, and today it covers partly Slovakian and partly Hungarian areas (Pest, Nógrád, Heves, and Borsod-Abaúj-Zemplén counties): Cserhát, Mátra, Bükk mountains and north of these horizontal basin and the Ipoly Valley - nearly 150 settlements.

The Palócs never had special rights, so their first written mention dates only from 1656, when the notary from Nagykőrös recorded the following in his account book: "I bought ten pairs of mother of pearl knives from the Palócs". Their own specific ancient name is "had", which is the name of all the Palócs living in the same community who bear the same surname, even if they are form a separate family.

Grand Prince (Hungarian: Nagyfejedelem) was the title used by contemporary sources to name the leader of the federation of the Hungarian tribes in the tenth century.

The grand prince (Nagyfejedelem) was probably elected by the leaders of the federation of the seven Hungarian tribes and the three Kabar tribes (dissident Khazar tribes) that joined the Hungarians before 830. However, the first grand prince, Álmos, father of Árpád, was more likely appointed by the khagan of the Khazars. It is still under discussion whether the grand prince was the spiritual leader of the federation (kende), the military commander of the Hungarian tribes (gyula) or the title was a new creation.

Géza (c. 940 – 997), also Gejza, was Grand Prince of the Hungarians from the early 970s. He was the son of Grand Prince Taksony and his Oriental—Khazar, Pecheneg or Volga Bulgarian—wife. He married Sarolt, a daughter of an Eastern Orthodox Hungarian chieftain. After ascending the throne, Géza made peace with the Holy Roman Empire. Within Hungary, he consolidated his authority with extreme cruelty, according to the unanimous narration of nearly contemporaneous sources. He was the first Hungarian monarch to support Christian missionaries from Western Europe. Although he was baptised (his baptismal name was Stephen), his Christian faith remained shallow and he continued to perform acts of pagan worship. He was succeeded by his son Stephen, who was crowned the first King of Hungary in 1000 or 1001.

The Kabars (Greek: Κάβαροι), also known as Qavars (Qabars) or Khavars, were Khazar rebels who joined Magyar tribes and the Rus' Khaganate confederations in the 9th century CE.

Leo IV the Khazar (Greek: Λέων ὁ Χάζαρος, romanized: Léōn ho Khazaros; 25 January 750 – 8 September 780) was Byzantine emperor from 775 to 780 AD. He was born to Emperor Constantine V and Empress Tzitzak in 750. He was elevated to co-emperor in the next year, in 751, and married to Irene of Athens in 769. When Constantine V died in September 775, while campaigning against the Bulgars, Leo IV became senior emperor. In 778 Leo raided Abbasid Syria, decisively defeating the Abbasid army outside of Germanikeia. Leo died on 8 September 780, of tuberculosis. He was succeeded by his underage son Constantine VI, with Irene serving as regent.