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Persoonlijke gegevens Casimir I OF KUYAVIA 

• Hij is geboren rond 1211.
• Titel: Prince Kujavia, Mazovia and Greater Poland
• Beroep: Prince.
• Hij is overleden op 14 december 1267.
• Een kind van Conrad I OF MASOVIA en Agafia OF RUS

Gezin van Casimir I OF KUYAVIA

Hij is getrouwd met Euphrosyne OF OPOLE.

Zij zijn getrouwd in het jaar 1257.

Kind(eren):

1. Wladyslaw I OF POLAND  1261-1333 
2. Euphemia OF KUYAVIA  ± 1265-1308 

• Het echtpaar heeft gemeenschappelijke voorouders.



Notities over Casimir I OF KUYAVIA

Casimir I of Kuyavia (Polish: Kazimierz I kujawski) (c. 1211 -14 December 1267) was Prince Kujavia, Mazovia and Greater Poland from 1233 until his death. He was son of Konrad I of Masovia, King of Poland and his wife Agafia of Rus.

Casimir received the Duchy of Kujavia on his father's death in 1233. In 1239 Casimir received a dowry from his second wife Constance, daughter of Henry II the Pious. In subsequent years, actively supporting his father's turbulent politics, brought him to the duchy of Gdansk. Casimir's brother, Boleslaw became Duke of Mazovia on the death of their father.

Casimir did not wish to create trouble with his brother Boleslaw over the inheritance. However when Boleslaw died in 1248 he was childless, all his possessions should have passed to his next brother who was Casimir. However, Boleslaw decided to leave his lands to their younger brother, Ziemowit.

In 1248, Casimir became threatened by the alliance of his younger brother, Ziemovit with Daniel of Galicia. As part of the alliance, Ziemovit married Daniel's daughter, Pereyaslava. In 1254, his brother made an alliance with the Teutons so that they would be defended against the advancing Baltic tribes. A coalition led by Boleslaw the Pious of Greater Poland in 1259 made Ziemovit give back some of the lands that were rightfully Casimir's. Some lands were given to Henry II the Pious.

In 1250, Casimir was trying to establish peaceful relations with the Yotvingians, who Casimir had regularly had border problems with. Unfortunately his peace plan wasn't supported by the Teutonic Order. With the Pope on their side, the Order was still very much against Casimir's peace plan. Eventually the peace plan with the Yotvingians did not succeed, Casimir needed to deal with other land problems elsewhere in his territory. In order to secure the northern border of his territory, he appealed to the Knights Templar who settled Luków. It was not until 1263 that relations with the Teutonic Order were back to normal.

Meanwhile, Casimir faced more troubles. In 1258 Boleslaw the Pious made an alliance with Wartislaw III, Duke of Pomerania. They launched an attack against Casimir, claiming lands that had been given to him illegally by Henry II the Pious. The attack resulted in a failure but Boleslaw the Pious did not give up. The following year, he succeeded in bringing great dukes in his coalition Casimir (Boleslaw V the Chaste, Casimir's brother, Siemovit and Daniel of Galicia). Peace negotiations were difficult and require the coalition to launch a new attack against Casimir in 1261. Taking advantage of the weakening of his father, Casimir's son, Leszek II the Black made a claim on his inheritance. Casimir lost the Duchy of Sieradz which he had divided between his sons.

Casimir died in 1267 and was buried in the Cathedral of Wloclawek.

Casimir's first marriage was to Jadwiga, whose origins are unknown. They had no children and she died in 1235.

Casimir married secondly in 1239 to Constance, daughter of Henry II the Pious and Anna of Bohemia. They had the following children:
Adelaide (before 7 April 1249-8 December 1291), nun
Leszek II the Black (1240/42-30 September 1288), Duke of the Fragmentation of Poland
Ziemomysl of Kuyavia (1241/45-29 October/24 December 1287), Duke of Kuyavia

After Constance died in 1257, Casimir married in the same year, Euphrosyne, daughter of Casimir I of Opole and Viola, and they had the following children:
Wladyslaw I the Elbow-high (1261-March 2, 1333), King of Poland (1320-1333)
Casimir (1261/62-10 June 1294), killed while in battle in Lithuania
Siemowit (1262/67-1309/14), Duke of Kuyavia-Brieg, married Anastasia of Galicia (daughter of Lev I of Galicia)
Euphemia (d.18 March 1308), married Yuri I of Galicia

Source: Wikipedia

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