Konrad Januszowic (ca. 1400 - 9 December 1412 or 1413Konrad certainly died before his father's death on 8 December 1429. Most likely he was dead by 1413, because in that year was born his first nephew, who received his name. It's assumed that the mention of the death of certain Prince Konrad on 9 December at the ''Liber Mortuorum'' of the monastery of Czersk refers to him. J. Grabowski: ''Dynastia Piastów mazowieckich'', Kraków 2012, pp. 461–462.), was a Polish prince member of the

House of Piast The House of Piast was the first historical ruling dynasty of Poland. The first documented Polish monarch was Duke Mieszko I (c. 930–992). The Piasts' royal rule in Poland ended in 1370 with the death of king Casimir III the Great. Branch ...

. He was the youngest son of Duke

Janusz I of Warsaw Janusz I of Warsaw (pl: ''Janusz I warszawski''), also known as Janusz I the Old (pl: ''Janusz I Starszy'') (c. 1347/52 – 8 December 1429), was a Polish prince member of the House of Piast in the Masovian branch, from 1373/74 Duke of Warsaw and ...

and

Danutė of Lithuania Danutė of Lithuania (baptized ''Anna''; – 26 November 1424), was a Lithuanian princess of the Gediminid dynasty and by marriage Duchess of Warsaw. She was a daughter of Kęstutis, Grand Duke of Lithuania, and his second wife, Birutė. Life V ...

, a daughter of

Kęstutis Kęstutis ( la, Kinstut, ; – 3 or 15 August 1382) was the Grand Duke of Lithuania. He was the Duke of Trakai and governed the Grand Duchy of Lithuania, 1342–1382, together with his brother Algirdas (until 1377), and with his nephew Jogaila ...

Life

He is only mentioned in the ''Tomicki Genealogy''; there is listed among the descendants of the Dukes of Masovia, indicating that he died childless. Konrad's name was found frequently in the Masovian branch of the Piast dynasty. He died at a young age, probably long before the death of his father. His burial place is unknown.

Notes

References

*J. Grabowski: ''Dynastia Piastów mazowieckich'', Avalon Editorial, Kraków 2012, pp. 461–462. *K. Jasiński: ''Rodowód Piastów mazowieckich'', Poznań – Wrocław 1998, p. 104. * O. Balzer: ''Genealogia Piastów'', vol. II, Avalon Editorial, Kraków 2005, p. 845. Dukes of Masovia Year of birth uncertain Year of death uncertain 1400 births 1413 deaths {{Poland-bio-stub