Konrad III Rudy
| Konrad III the Red | |
|---|---|
| Duke of Masovia | |
 |
|
| Spouse(s) | Magdalena Stawrot m. 1468/70 - wid. 1476/77 N, daughter of Alexius m. 1477 - wid. (or div.) 1493 Anna Radziwiłł m. 1496/97 - his death |
| Issue | |
| Noble family | House of Piast |
| Father | Bolesław IV of Warsaw |
| Mother | Barbara Olelkovna |
| Born | 1447/48 |
| Died | 28 October 1503 (aged 56-57) Osieck |
| Buried | St. John's Archcathedral, Warsaw |
Konrad III the Red (pl: Konrad III Rudy; 1447/48 – 28 October 1503), was a Polish prince member of the House of Piast in the Masovian branch. He was a duke of Czersk, Liw, Warsaw, Nur, Łomża, Ciechanów, Różan, Zakroczym and Wyszogród during 1454-1471 jointly with his brothers (under regency until 1462), Duke of Płock, Wizna, Płońsk and Zawkrze during 1462-1471, and after the division of the paternal domains in 1471, sole ruler over Czersk and Liw, over Wyszogród during 1474-1489 and again in 1495, over Zakroczym since 1484, over Nur since 1488 and over Warsaw since 1489.
He was the third son of Bolesław IV of Warsaw and Barbara Olelkovna of Slutsk-Kapy, a Lithuanian princess, (granddaughter of Vladimir Olgerdovich). The premature death of his two older brothers during 1453-1454 left him as the eldest surviving son of his family.
After the death of his father on 10 September 1454, Konrad III and his younger siblings were placed under the guardianship of their mother Barbara and Paweł Giżycki, Bishop of Płock. The regency ended in 1462, when Konrad III attained his majority and became in the legal guardian of his younger brothers.
At the beginning of 1462 arrived the news of the deaths of the neighboring Dukes of Płock, Siemowit VI and Władysław II without heirs. Konrad III, as the closest male relative and hoping to reunited the whole Masovian lands, immediately assumed the title of Duke of Płock. Unfortunately, King Casimir IV also put his claims over the lands, under the excuse of being the Polish sovereign they had to reverted to the crown. He soon occupied Belz, Rawa Mazowiecka and Gostynin, who were formally added to the kingdom; however, the Thirteen Years' War and the fear of an intervention of the Teutonic Knights, united with the disapproval of the Masovian nobility over the too aggressive politics of the Casimir IV, forced him to accept temporarily the rule of Konrad III over Płock, Płońsk and Zawkrze —although the major support of Konrad III was Princess Catherine of Płock, aunt of the late dukes, whose energetic attitude played a major part in the conflict.
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