Gediminids in the context of "House of Gediminas"

The Jagiellonian (US: /ˌjɑːɡjəˈloʊniən/ YAH-gyə-LOH-nee-ən) or Jagellonian dynasty (US: /ˌjɑːɡəˈ-/ YAH-gə-; Lithuanian: Jogailaičių dinastija; Polish: dynastia jagiellońska), otherwise the Jagiellon dynasty (Polish: dynastia Jagiellonów), the House of Jagiellon (Polish: Dom Jagiellonów), or simply the Jagiellons (Lithuanian: Jogailaičiai; Polish: Jagiellonowie; Latin: Iagellonidae), was the name assumed by a cadet branch of the Lithuanian ducal dynasty of Gediminids upon reception by Jogaila, the Grand Duke of Lithuania, of baptism as Ladislaus in 1386, which paved the way to his ensuing marriage to the Queen Regnant Hedwig of Poland, resulting in his ascension to the Crown of the Kingdom of Poland as Ladislaus II Jagiełło (initially ruling jure uxoris jointly with Jadwiga until her death), and the effective promotion of his branch to a royal dynasty. The Jagiellons were polyglots and per historical evidence Casimir IV Jagiellon and his son Saint Casimir possibly were the last Jagiellons who spoke in their patrilineal ancestors' Lithuanian language; however, even the last patrilineal Jagiellonian monarch Sigismund II Augustus maintained two separate and equally lavish Lithuanian-speaking and Polish-speaking royal courts in Lithuania's capital Vilnius. The Jagiellons reigned in several European countries between the 14th and 16th centuries. Members of the dynasty were Kings of Poland (1386–1572), Grand Dukes of Lithuania (1377–1392 and 1440–1572), Kings of Hungary (1440–1444 and 1490–1526), and Kings of Bohemia and imperial electors (1471–1526).

The personal union between the Kingdom of Poland and the Grand Duchy of Lithuania (converted in 1569 with the Treaty of Lublin into the Polish–Lithuanian Commonwealth) is the reason for the common appellation "Poland–Lithuania" in discussions about the area from the Late Middle Ages onward. One Jagiellon, Ladislaus III of Poland, briefly ruled both Poland and Hungary (1440–1444), and two others ruled both Bohemia and Hungary (1490–1526) and then continued in the distaff line as a branch of the House of Habsburg.

Red Ruthenia, also called Red Rus' or Red Russia, is a term used since the Middle Ages for the south-western principalities of Kievan Rus', namely the Principality of Peremyshl and the Principality of Belz. It is closely related to the term Cherven Cities ("Red Cities").

First mentioned by that name in a Polish chronicle of 1321, Red Ruthenia was the portion of Ruthenia incorporated into Poland by Casimir the Great during the 14th century. Following the Mongol invasion of Kievan Rus' in the 13th century, Red Ruthenia was contested by the Grand Duchy of Lithuania (the Gediminids), the Kingdom of Poland (the Piasts), the Kingdom of Hungary and the Kingdom of Galicia–Volhynia. After the Galicia–Volhynia Wars, for about 400 years, most of Red Ruthenia became part of Poland as the Ruthenian Voivodeship.

Gediminas (c. 1275 – December 1341) was Grand Duke of Lithuania from 1315 or 1316 until his death in 1341. Gediminas is traditionally considered to have been the founder of Vilnius, the capital city of Lithuania (see: Iron Wolf legend). During his reign, he brought under his rule lands streching from the Baltic Sea to the Black Sea. The Gediminids dynasty he founded and which is named after him came to rule over Poland, Hungary and Bohemia.

Gediminas's Cap (Lithuanian: Gedimino kepurė) was the most important regalia of the Lithuanian monarchs who ruled the Grand Duchy of Lithuania until the Union of Lublin in 1569. During the inaugurations of Lithuanian monarchs, Gediminas's Cap was placed on the monarch's heads by the Bishop of Vilnius in Vilnius Cathedral.

Its name comes from Grand Duke Gediminas (c. 1275–1341), the founder of the Gediminids dynasty and patrilineal ancestor of Lithuanian rulers from the Kęstutaičiai and Jagiellonian dynasties, and symbolized the dynasty's continuity. The cap is mentioned in 16th-century sources and was kept in the Vilnius Castle treasury. It is depicted as a round unsegmented headdress in an armorial compiled for Paweł Holszański. Since 1547 Gediminas's Cap was minted on Lithuanian coins above the coat of arms of Lithuania. Gediminas's Cap lost its significance following the Union of Lublin in 1569 which abolished a separate inauguration of the Lithuanian monarchs in Vilnius Cathedral.

The Columns of Gediminas or Pillars of Gediminas (Lithuanian: Gediminaičių stulpai, lit. 'Pillars of the Gediminids'; Belarusian: Калюмны, romanized: Kaliumny, 'Columns') are one of the earliest symbols of Lithuania and its historical coats of arms. They were used in the Grand Duchy of Lithuania, initially as a rulers' personal insignia, a state symbol, and later as a part of heraldic signs of leading aristocracy.