Jagielloski

Jagielloski is a Polish surname and adjectival form meaning “of the Jagiellon dynasty.” The Jagiellon dynasty was a medieval–early modern royal house that ruled parts of Poland, Lithuania, and their territories from the late 14th to the 16th century, beginning with Jogaila’s marriage to Jadwiga and the subsequent union of Poland and Lithuania. The name derives from Jagiełło (Władysław II Jagiełło), the dynasty’s founder and an ancestor of many later rulers.

In Polish usage, Jagielloński (the standard form with the ł) functions as an adjective denoting origin or affiliation with the Jagiellons, and as a toponymic or patronymic surname. In English-language contexts, variants without diacritics or with simplified spelling—such as Jagiellonski or Jagielloński—are common in historical and genealogical writing.

Notable uses of the Jagiellonian name include institutions that emphasize historic ties to the dynasty. The most prominent is the Jagiellonian University (Uniwersytet Jagielloński) in Kraków, one of the oldest universities in Europe, founded in the 14th century and historically associated with the Jagiellon era. The term also appears in discussions of heraldry, noble lineages, and regional place names connected to the dynasty’s rule.

See also: Jagiellon dynasty; Jogaila/Jagiello; Jagiełło; Jagiellonian University. The spelling Jagielloski may appear in non-Polish texts or transliterations that omit diacritics.