William of Celje (German: Wilhelm von Cilli, Slovene: Viljem Celjski; c. 1361 – 19 August 1392), also William of Cilli, Count of Celje, was a Styrian nobleman who was married to Anna of Poland, daughter of the Polish king Casimir the Great.
His son William married Anna of Poland, daughter of the Polish king Casimir III the Great. The Counts of Cilli were related by marriage with rulers of Bosnia and Polish and Hungarian kings.  Also through the Barbara of Cilli the Counts were in kinship with kings of Bohemia.
Life and achievements. Little is known of Ulrich's early life. He was the firstborn son of Frederick, first Count of Celje, and his wife Diemut Wallsee.Frederick had inherited the Celje Castle and the surrounding estates through his mother Catherine, daughter of the last Carinthian Count of Heunburg (Vovbre, in Slovene) and Agnes of Baden, the unsuccessful claimant to the Babenberg inheritance.
William of Celje: Hermann II, Count of Celje ∞ Anna Schaunberg: Elizabeth of Bosnia: Louis I of Hungary: 2.Anna of Celje: Władysław II Jagiełło: Frederick II, Count of Celje ∞1.Elizabeth Frankopan 2.Veronika of Desenice: 2.Barbara of Celje: Sigismund, Holy Roman Emperor: 1.Mary of Hungary: 1.Jadwiga of Poland: Ulrich II, Count of Celje ...
About William, Count of Celje Viljem Celjski, celjski grof in sovladar Hermana II., * ?, † 19. avgust 1392. Kot edinec se je Viljem po letu 1360 rodil Adelajdi Ortenburški in Ulriku I. Kot otrok se je leta 1373 zaročil in istega leta poročil z Elizabeto Goriško-tirolsko, hčerjo Majnharda Goriškega, ki je za hčer obljubil doto 3000 mark ...
The Counts of Cilli (German: Grafen von Cilli; Hungarian: cillei grófok, Slovene: Celjski grofje) or the Counts of Celje were the most important late medieval noble family on the territory of present-day Slovenia. They managed the County of Cilli. Risen as vassals of the Habsburg dynasty, at the time the comital house died out they held the rank of immediate counts (Reichsgrafen) and Princes ...
He was the second-born son of Frederick of Sanneck, first Count of Celje, and his wife Diemut from the noble Wallsee family. His father had inherited the Celje Castle and took possession of it in 1332, but it's unclear whether Hermann was born there or in the nearby Žovnek Castle , their ancestral home.
Hermann II (Slovene: Herman; early 1360s – 13 October 1435), Count of Celje, was a Styrian nobleman and magnate, most notable as the faithful supporter and father-in-law of the Hungarian king and Holy Roman Emperor Sigismund of Luxembourg.
In 1380 Anna was married to William, Count of Celje (1361–1392), a man chosen by Anna's first cousin, King Louis I, from among his allies on the Hungarian southern borderlands. They had a single surviving child, a daughter known as Anna of Cilli (1386–1416).
William of Celje (Wilhelm von Cilli, Viljem Celjski; c. 1361 – 19 August 1392), also William of Cilli, Count of Celje, was a Styrian nobleman who was married to Anna of Poland, daughter of the Polish king Casimir the Great.