Konrad V Kantner (ca. 1385 – 10 September 1439) was a duke ofOleśnica,Koźle, half ofBytom and half ofŚcinawa during 1412–1427 (with his brothers as co-rulers), since 1427 sole ruler overOleśnica.

Konrad V Kantner
Duke of Oleśnica, Koźle
Coat-of-arms of Silesia
Born	ca. 1385
Died	10 September 1439
Noble family	Silesian Piasts of Oleśnica
Spouse(s)	Margareta
Issue	Konrad IX the Black Konrad X the White Anna Margareta
Father	Konrad III the Old
Mother	Judith/Guta

He was the second son ofKonrad III the Old, Duke ofOleśnica, by his wife Judith. Like his one older and three younger brothers, at the baptism he received the name of Konrad, which was characteristic in this branch of theHouse of Piast. His nickname ofKantner was derived from the town ofKanth (pl:Kąty Wrocławskie), who was a property of the Oleśnica dukes since 1379.

After the death of his father in 1412, Konrad V succeeded him in all his lands together with his older brotherKonrad IV the Elder as co-rulers, due to the minority of their younger brothers.

In 1416, when all Konrad III's sons attained his majority, Konrad IV renounced to the government on behalf of Konrad V and the rest of his brothers. However, because two other brothers (Konrad VI the Dean andKonrad VIII the Younger), also pursued a Church career, the main beneficiaries in the government are two others laic brothers: Konrad V andKonrad VII the White, who in 1431 co-founded inKoźle a Minorites Cloister. In 1434 they purchased the town ofWołczyn to DukeLouis II of Brieg. The co-rulership was maintained until 1427, when was made the division of the Duchy: Konrad V retained the main city ofOleśnica.

Like his brothers, Konrad V fought against theHussites. In 1428 they tried unsuccessfully to prevent their depredations in theDuchy of Troppau. On 4 April 1431 they raidedGliwice, which was occupied by the Hussites and where just held religious discussions in which the Lithuanian prince Sigismund Korybut, a nephew ofVytautas, was involved. Presumably, therefore, undertook the Hussites in 1432 a raid into the Duchy of Oleśnica, which was largely spared from them until then. Konrad V and his brothers, however, managed to defeat them atŚcinawa. Together with his brother Konrad IV, other Piast Dukes and the cities ofWrocław,Świdnica andNysa was notarized on 13 September 1432 for the Hussites the still occupied cities ofNiemcza,Kluczbork andOtmuchów the amount of 10,000 groschen for damages.

Their fight against the Hussites was rewarded byEmperor Sigismund, who, in his capacity as King of Bohemia, in 1434 transfer to them the districts ofPsie Pole andPsary. Three years later, in 1437 he confirmed to them the complete investiture of this territories byEscheat, so that upon the death of the childless Konrad VII they could reverted to the Kingdom. Two years later, Konrad V died of the plague. The guardianship of his minor sons was taken by his brother Konrad VII.

By 9 October 1411, Konrad V married Margareta (d. 15 March 1449), whose origins are unknown. They had five children:

1. Agnes (b. aft. 1411 – d. Herbst, September 1448), married in 1437 toKaspar I Schlik, Count of Passaun-Weisskirchen and Imperial Chancellor.
2. Konrad IX the Black (b. ca. 1415 – d. 14 August 1471).
3. Konrad X the White (b. 1420 – d. 21 September 1492).
4. Anna (b. ca. 1425? – d. aft. 15 August 1482), married by 1444 to DukeWładysław I of Płock.
5. Margareta (b. by 1430 – d. 10 May 1466), Abbess of Trebnitz (1456).

In his will, Konrad V leave the town ofWołów to his wife as herdower, who was ruled by her until her own death. His sons were excluded from the government by their uncle Konrad VII, who maintained his rule until 1450, when they finally deposed him and assumed the full control over the Duchy.

• Historische Kommission für Schlesien (ed.):Geschichte Schlesiens, vol. 1, Sigmaringen 1988, p. 175, 184, 190, 197, 200, 204.
• Hugo Weczerka: Handbuch der historischen Stätten:Schlesien. Stuttgart, 1977, p. 73 and 216 and genealogy table on pp. 594–595.
• Rudolf Žáček:Dějiny Slezska v datech. Prague 2004, p. 435.
• Marek, Miroslav."Complete Genealogy of the House of Piast". Genealogy.EU.^{[self-published source][better source needed]}
• This article was translated from the originals in Polish and German Wikipedia.