Anna of Poland (1366-1425) was countess consort of Celje, a medieval Slovenian feudal state, and an influential woman in politics of Poland. Celje (German Cilli, Hungarian Cille) (46. ...

She was daughter of king Casimir III of Poland (1309-70), who was succeeded, not by Anna nor any of Casimir's descendants, but by Casimir's nephew Louis I of Hungary. Anna's mother was Casimir's fourth wife Jadwiga of Glogau (d 1390). Anna's elder half-sisters were already dead though one of them had left children. Anna was the eldest of that fourth marriage, which did not either produce sons to king Casimir's dismay. Casimir the Great Casimir III the Great (Polish: Kazimierz Wielki), (1310-1370), King of Poland, son of king Władyslaw I Łokietek (Wladyslaw the Elbow High), 1305-1333 and Jadwiga of Gniezno and Great Poland. ... Louis the Great. ...

In 1380 Anna was married to William, Count of Celje (1361-92), a man selected by Anna's first cousin, the king Louis, among his vassals in Hungarian south.

They had an only surviving child, a daughter known as Anna of Celje (1386-1416).

In 1394 the widowed Anna married secondly, Ulrich, Duke of Teck (died 1432).

Meanwhile, Poland had passed in 1386 to Jogaila Wladyslaw Jagiello, Grand Duke of Lithuania. When Wladyslaw Jagiello's first wife the reigining queen Jadwiga of Poland, Anna's first cousin once removed, had died in 1399 (without surviving children), Wladyslaw was seeking a wife amongst heirs to the kingdom of Poland, Jadwiga's patrimony. Duchess Anna desired to regain Poland for her heirs, direct descendants of Casimir III, and to obtain power in her birth country. Her young daughter Anna was married in 1401 or 1402 to the widowed Wladyslaw Jagiello, then aged around 50. She gave birth to a daughter, Princess Jadwiga of Lithuania, in 1408. ... This article is about the 14th-century queen and saint. ... Jadwiga (8 April 1408 - 8 December 1431) of the House of Jagiellon was a daughter of Jogaila Władysław II Jagiełło, King of Poland and Grand Duke of Lithuania. ...

Anna of Poland, Duchess of Teck and Countess of Celje worked to advance her daughter's and her granddaughter's position in Poland. Her daughter Anna died in 1416, without further surviving children.

Jogaila then married in 1417 Elisabeth of Pilica, and in 1422 Sophia of Halshany, both of whom did not descend from Piast kings of Poland, as Jogaila was not able to find any more brides with a hereditary right to the kingdom of Poland. Jogaila's sons and heirs were born of Sophia. Sophia of Halshany (Lithuanian: Zofija Alšėniškė; Polish: Zofia Holszańska) (1405?-1461), Lithuanian noblewoman from Halshany (Lithuanian Alšėnai, now Halshany in Belarus), Polish Queen (1442-1461), wife of Wladyslaw II Jagielo (Jogaila). ...

In 1421 her granddaughter Jadwiga was betrothed to the future Frederick II, Margrave of Brandenburg Template:Cit (1413-70), at the time still the second son and a heir of Frederick I, Elector of Brandenburg. A party of Polish nobles, including the grandmother Anna, wanted Anna's granddaughter Jadwiga and her future husband to succeed Jogaila (in Poland at least), instead of her father's sons by Sofia. Frederick II the Iron (sometimes Irontooth) (1413-1470) of the Hohenzollern dynasty, was margrave of Brandenburg, from 1440 until his abdication in 1470. ... Frederick (German: Friedrich) I (1371–1440), Burgrave of Nuremberg as Frederick VI and Margrave of Brandenburg as Frederick I from the House of Hohenzollern. ...

In 1425 Anna died. This left Jadwiga without any strong relatives to support her position.

In 1431 her only granddaughter Jadwiga, died without any issue, rumoredly by poison. Anna's descent went extinct before Jogaila's death which occurred as late as in 1434.