Question: What is the date of death of Andrew, Duke Of Slavonia's father?

Knowledge 1: Andrew, Duke of Slavonia
Andrew, Duke of Slavonia (1268–1278) was the youngest son of King Stephen V of Hungary and his wife, Elizabeth the Cuman.Two rebellious lords kidnapped him in 1274 in an attempt to play him off against his brother, Ladislaus IV of Hungary, but the king's supporters liberated him.He was styled "Duke of Slavonia and Croatia" in a 1274 letter.Years after his death (in 1290 and in 1317), two adventurers claimed to be identical with Andrew, but both failed. [SEP] Knowledge 2: Stephen V of Hungary
Stephen V (before 18 October 1239 – 6 August 1272, Csepel Island) was King of Hungary and Croatia between 1270 and 1272, and Duke of Styria from 1258 to 1260.He was the oldest son of King Béla IV and Maria Laskarina.King Béla had his son crowned king at the age of six and appointed him Duke of Slavonia.Still a child, Stephen married Elizabeth, a daughter of a chieftain of the Cumans whom his father settled in the Great Hungarian Plain.King Béla appointed Stephen Duke of Transylvania in 1257 and Duke of Styria in 1258.The local noblemen in Styria, which had been annexed four years before, opposed his rule.Assisted by King Ottokar II of Bohemia, they rebelled and expelled Stephen's troops from most parts of Styria.After Ottokar II routed the united army of Stephen and his father in the Battle of Kressenbrunn on 12 July 1260, Stephen left Styria and returned to Transylvania.Stephen forced his father to cede all the lands of the Kingdom of Hungary to the east of the Danube to him and adopted the title of junior king in 1262.In two years, a civil war broke out between father and son, because Stephen accused Béla of planning to disinherit him.They concluded a peace treaty in 1266, but confidence was never restored between them.Stephen succeeded his father, who died on 3 May 1270, without difficulties, but his sister Anna and his father's closest advisors fled to the Kingdom of Bohemia.Ottokar II invaded Hungary in the spring of 1271, but Stephen routed him.In next summer, a rebellious lord captured and imprisoned Stephen's son, Ladislaus.Shortly thereafter, Stephen unexpectedly fell ill and died.
Knowledge 1: Stephen V of Hungary
Stephen V (before 18 October 1239 – 6 August 1272, Csepel Island) was King of Hungary and Croatia between 1270 and 1272, and Duke of Styria from 1258 to 1260.He was the oldest son of King Béla IV and Maria Laskarina.King Béla had his son crowned king at the age of six and appointed him Duke of Slavonia.Still a child, Stephen married Elizabeth, a daughter of a chieftain of the Cumans whom his father settled in the Great Hungarian Plain.King Béla appointed Stephen Duke of Transylvania in 1257 and Duke of Styria in 1258.The local noblemen in Styria, which had been annexed four years before, opposed his rule.Assisted by King Ottokar II of Bohemia, they rebelled and expelled Stephen's troops from most parts of Styria.After Ottokar II routed the united army of Stephen and his father in the Battle of Kressenbrunn on 12 July 1260, Stephen left Styria and returned to Transylvania.Stephen forced his father to cede all the lands of the Kingdom of Hungary to the east of the Danube to him and adopted the title of junior king in 1262.In two years, a civil war broke out between father and son, because Stephen accused Béla of planning to disinherit him.They concluded a peace treaty in 1266, but confidence was never restored between them.Stephen succeeded his father, who died on 3 May 1270, without difficulties, but his sister Anna and his father's closest advisors fled to the Kingdom of Bohemia.Ottokar II invaded Hungary in the spring of 1271, but Stephen routed him.In next summer, a rebellious lord captured and imprisoned Stephen's son, Ladislaus.Shortly thereafter, Stephen unexpectedly fell ill and died. [SEP] Knowledge 2: Catherine of Bosnia, Baness of Slavonia
Catherine Kotromanić Babonić(? – after 1310) was Princess of Bosnia and Baness of Slavonia by marriage.Catherine was child of Prijezda I Kotromanić and his wife Elizabeth of Slavonia.Her brothers were Vuk, Prijezda and Stephen.Catherine was married to Stpehen III Babonić.They had two sons: Catherine and her husband were given Zemunik Fortress in Vrbas area by Prijezda I in spring 1287.Catherine was Baness of Slavonia from 1310 to 1316.
Knowledge 1: Andrew, Duke of Slavonia
Andrew, Duke of Slavonia (1268–1278) was the youngest son of King Stephen V of Hungary and his wife, Elizabeth the Cuman.Two rebellious lords kidnapped him in 1274 in an attempt to play him off against his brother, Ladislaus IV of Hungary, but the king's supporters liberated him.He was styled "Duke of Slavonia and Croatia" in a 1274 letter.Years after his death (in 1290 and in 1317), two adventurers claimed to be identical with Andrew, but both failed. [SEP] Knowledge 2: Catherine of Bosnia, Baness of Slavonia
Catherine Kotromanić Babonić(? – after 1310) was Princess of Bosnia and Baness of Slavonia by marriage.Catherine was child of Prijezda I Kotromanić and his wife Elizabeth of Slavonia.Her brothers were Vuk, Prijezda and Stephen.Catherine was married to Stpehen III Babonić.They had two sons: Catherine and her husband were given Zemunik Fortress in Vrbas area by Prijezda I in spring 1287.Catherine was Baness of Slavonia from 1310 to 1316.

Answer: 6 August 1272