Gyulafehérvár in the context of "Union of Transylvania with Romania"

John Sigismund Zápolya or Szapolyai (Hungarian: Szapolyai János Zsigmond; 7 July 1540 – 14 March 1571) was King of Hungary as John II from 1540 to 1551 and from 1556 to 1570, and the first Prince of Transylvania, from 1570 to his death. He was the only son of John I, King of Hungary, and Isabella of Poland. John I ruled parts of the Kingdom of Hungary with the support of the Ottoman Sultan Suleiman; the remaining areas were ruled by Ferdinand I of Habsburg, who also ruled Austria and Bohemia. The two kings concluded a peace treaty in 1538 acknowledging Ferdinand's right to reunite Hungary after John I's death, though shortly after John Sigismund's birth, and on his deathbed, John I bequeathed his realm to his son. The late king's staunchest supporters elected the infant John Sigismund king, but he was not crowned with the Holy Crown of Hungary.

Suleiman invaded Hungary under the pretext of protecting John Sigismund from Ferdinand. Buda, the capital of Hungary, fell to the Ottomans without opposition in 1541, but Suleiman allowed the dowager queen, Isabella, to retain the territory east of the river Tisza on John Sigismund's behalf. Isabella and John Sigismund moved to Lippa (now Lipova in Romania). Before long, they took up residence in Gyulafehérvár in Transylvania (Alba Iulia in Romania). John Sigismund's realm was administered by his father's treasurer, George Martinuzzi, who sought to reunite Hungary under the rule of Ferdinand. Martinuzzi forced Isabella to renounce her son's realm in exchange for two Silesian duchies and 140,000 florins in 1551. John Sigismund and his mother settled in Poland, but she continued to negotiate for John Sigismund's restoration with Ferdinand's enemies.

Koppány, also called Cupan was a Hungarian lord in the late 10th century and leader of pagans opposing the Christianization of Hungary. As the duke of Somogy, he laid claim to the throne based on the traditional idea of seniority, but was defeated and executed by Stephen (born with the pagan name Vajk), son of the previous grand prince Géza.

According to modern scholars' consensus view, he was a member of the royal Árpád dynasty. Koppány was the lord of the southern region of Transdanubia during the reign of Géza, who ruled between the early 970s and 997. After the death of Géza, Koppány laid claim to the throne against Géza's devout Christian son, Stephen. His claim was mainly supported by pagan Hungarians, but the royal army routed his army near Veszprém in 997 or 998. Koppány was killed either in the battle or in his duchy, whither he had fled from the battlefield. His corpse was cut in four pieces to be displayed on the walls of four major strongholds of Hungary, Győr, Veszprém, Esztergom and Gyulafehérvár (now Alba Iulia, Romania).