Stibor of Stiboricz

Stibor of Stiboricz of Ostoja (also written in English as Scibor or Czibor; Polish: Ścibor ze Ściborzyc, Hungarian: Stiborici Stibor, Romanian: Ştibor de Ştiborici, Slovak: Stibor zo Stiboríc; c. 1348 – February 1414) was an aristocrat of Polish origin in the Kingdom of Hungary. He was a close friend of King Sigismund of Hungary who appointed him to several offices during his reign. For instance, between 1395 and 1401, then from 1409 to 1414 he was the Voivode of Transylvania (now in Romania). Stibor styled himself "Lord of the whole Váh", referring to his properties along the 409-km-long river (in present-day Slovakia) where 15 of his 31 castles were situated.

Stibor descended from a Polish noble family of the Clan of Ostoja whose possessions were located around Bydgoszcz in Greater Poland; his father was Mościc, Voivode of Gniewkowo. Stibor arrived in the Kingdom of Hungary during the reign of King Louis I who also inherited the title of King of Poland (1370–1382). Following the king's death (10 September 1382), the Dowager Queen Elisabeth, who governed the two kingdoms in the name of his daughters, made Stibor the governor of Kuyavia and Łęczyca in Poland in 1383. Around this time, Stibor became the close friend of Margrave Sigismund of Brandenburg (the future king of Hungary, who later also became German Emperor), the fiancé of Queen Mary of Hungary, who had been living in the Hungarian court since 1379.

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