Short answers, pulled from the story.
Beatrice of Naples (1457-1508) was a princess of the Kingdom of Naples who became Queen of Hungary twice, first by marrying Matthias Corvinus in 1476 and then by marrying Vladislaus II in 1491. She is notable for introducing Italian Renaissance culture into the Hungarian court, encouraging the Bibliotheca Corviniana, and exercising real political influence during both reigns.
Beatrice of Naples was the daughter of Ferdinand I of Naples and Isabella of Clermont. She received her education at her father's court in Naples before her engagement in 1474.
Beatrice married Matthias Corvinus on the 22nd of December 1476 in Buda. She was subsequently crowned Queen of Hungary at Székesfehérvár, and the marriage secured an alliance between Hungary and Naples.
The pope declared Beatrice's marriage to Vladislaus II illegal in 1500 because Vladislaus had not obtained a divorce from his first wife before the 1491 wedding. Vladislaus also claimed he had been forced into the marriage against his will. Beatrice was ordered to pay the costs of the annulment trial.
Beatrice introduced Italian Renaissance ideas to the Hungarian court. She encouraged Matthias Corvinus's work with the Bibliotheca Corviniana, oversaw the building of the palace at Visegrád as a royal residence, and founded an academy.
Beatrice of Naples died on the 23rd of September 1508 in Naples. She had returned to Naples in 1501 after her second marriage was annulled by the pope in 1500.