Question: In which period the son of John Hunyadi was a King of Hungary and Croatia?

Context paragraphs:
John Hunyadi: John Hunyadi (Hungarian: "Hunyadi János" , Romanian: "Ioan de Hunedoara" ; 1406 – 11 August 1456) was a leading Hungarian military and political figure in Central and Southeastern Europe during the 15th century.  According to most contemporary sources, he was the son of a noble family of Romanian ancestry.  He mastered his military skills on the southern borderlands of the Kingdom of Hungary that were exposed to Ottoman attacks.  Appointed voivode of Transylvania and head of a number of southern counties, he assumed responsibility for the defense of the frontiers in 1441.

Battle of Hermannstadt: The Battle of Hermannstadt, also known as the Battle of Sibiu or the Battle of Szeben, was fought between the army of the Hungarian Kingdom and the Ottoman Turks on March 18 and March 25, 1442, near Sântimbru (Marosszentimre) and Hermannstadt (Sibiu, Szeben).  The Hungarian forces were commanded by John Hunyadi.  Hermannstadt was Hunyadi's third victory over the Ottomans after the relief of Smederevo in 1437 and the defeat of Ishak Beg midway between Semendria and Belgrade in 1441.

Blaise Magyar: Blaise Magyar (Hungarian: "Magyar Balázs" ), also Blaž the Magyar, was a military commander and great officer of state in the Kingdom of Hungary in the 15th century.  His military career started under the command of John Hunyadi.  In the reign of John Hunyadi's son, Matthias Corvinus, he was Ban of Croatia from 1470 to 1472 and in 1483, Ban of Slavonia between 1470 and 1471 and in 1483, Ban of Bosnia from 1470 to 1471, and Voivode of Transylvania between 1472 and 1475.  He died at Kassa (now Košice in Slovakia) in 1490.

Hunyadi family: The Hunyadi family was one of the most powerful noble families in the Kingdom of Hungary during the 15th century.  A member of the family, Matthias Corvinus, was King of Hungary from 1458 until 1490, King of Bohemia (ruling in Moravia, Lower Lusatia, Upper Lusatia, and Silesia) from 1469 until 1490, and Duke of Austria from 1487 until 1490.  His illegitimate son, John Corvinus, ruled the Duchy of Troppau from 1485 until 1501, and five further Silesian duchies, including Bytom, Głubczyce, Loslau, Racibórz, and Tost, from 1485 until 1490.  The Hunyadi coat-of-arms depicted a raven with a golden ring in its beak.

Battle of Nish (1443): At the Battle of Niš ("Battle of Nish") (early November, 1443), crusaders led by John Hunyadi, captured the Ottoman stronghold of Nish (now Niš, Serbia) and defeated three armies of the Ottoman Empire.  The Battle of Niš was part of Hunyadi's expedition known as the "long campaign".  Hunyadi, at the head of the vanguard, crossed the Balkans through the Gate of Trajan, captured Niš, defeated three Turkish pashas, and after taking Sofia, united with the royal army and defeated Sultan Murad II at Snaim (Kustinitza).  The impatience of the king and the severity of the winter then compelled him (in February 1444) to return home, but not before he had utterly broken the Sultan's power in Bosnia, Herzegovina, Serbia, Bulgaria, and Albania.

John Székely de Szentgyörgy: John Székely de Szentgyörgy (died 18 October 1448) was a Hungarian baron, who served as ban of Croatia, Dalmatia and Slavonia between June 1446 and January 1448.  He was a brother-in-law of regent John Hunyadi.  His son Thomas Székely was prior of Vrana.

Erzsébet Szilágyi: Erzsébet Szilágyi (Hungarian: "Szilágyi Erzsébet" , c. 1410–1483) was a Hungarian noblewoman, spouse of John Hunyadi and mother of Matthias Corvinus, King of Hungary.

Vlad the Impaler: Vlad III, known as Vlad the Impaler (Romanian: "Vlad Țepeș" , ) or Vlad Dracula ( ; 1428/311476/77), was voivode (or prince) of Wallachia three times between 1448 and his death.  He was the second son of Vlad Dracul, who became the ruler of Wallachia in 1436.  Vlad and his younger brother, Radu, were held as hostages in the Ottoman Empire from 1442 to secure their father's loyalty.  Vlad's father and eldest brother, Mircea, were murdered after John Hunyadi, Regent-Governor of Hungary, invaded Wallachia in 1447.  Hunyadi installed Vlad's second cousin, VladislavII, as the new voivode.

John Hunyadi, Ban of Severin: John Hunyadi, Jr. ("c." 1419 – 1440 or 1441) was a Hungarian noble and knight banneret from the House of Hunyadi, younger brother of regent John Hunyadi as the second son of Vajk (Voyk) and Erzsébet (Elizabeth) Morzsinai (Morsina/Marsina).

Matthias Corvinus: Matthias Corvinus, also called Matthias I (Hungarian: "Hunyadi Mátyás" , Croatian: "Matija Korvin" , Romanian: "Matei Corvin" , Slovak: "Matej Korvín" , ; 23 February 1443 – 6 April 1490), was King of Hungary and Croatia from 1458 to 1490.  After conducting several military campaigns, he was elected King of Bohemia in 1469 and adopted the title Duke of Austria in 1487.  He was the son of John Hunyadi, Regent of Hungary, who died in 1456.  In 1457, Matthias was imprisoned along with his older brother, Ladislaus Hunyadi, on the orders of King Ladislaus V of Hungary.  Ladislaus Hunyadi was executed, causing a rebellion that forced King Ladislaus to flee Hungary.  After the King died unexpectedly, Matthias's uncle Michael Szilágyi persuaded the Estates to unanimously proclaim Matthias king on 24 January 1458.  He began his rule under his uncle's guardianship, but he took effective control of government within two weeks.

Supporting paragraphs: Blaise Magyar Matthias Corvinus
Answer: 1458 to 1490