Sigismund of Luxembourg (Czech: Zikmund Lucemburský) (15 February 1368 – 9 December 1437), also referred to as the Red Fox (Czech: liška ryšavá) by Bohemians, was King of Hungary and Croatia, Germany, Bohemia, Italy and at a later point in life the Emperor of the Holy Roman Empire. He was a son of Charles IV and younger half-brother of Wenceslas IV of Bohemia. The actions of him and his army lead to the events of Kingdom Come: Deliverance.
西吉斯蒙德是卢森堡王朝的查理四世的次子，瓦茨拉夫四世的异母弟。1387年成为妻子玛丽亚一世的匈牙利共治国王，1395年玛丽亚死于骑马意外，他成为唯一国王。西吉斯蒙德一生致力于统一天主教会、对抗奥斯曼帝国，为此债台高筑，出售大量领地和特权；但除了结束教宗并立，两项事业都未能成功。1396年他发动十字军进攻奥斯曼，在尼科波利斯战役中惨败，他也威信扫地，导致匈牙利王权衰落。他利用波希米亚乱局，谋夺兄长王位，背信允许教会处死胡斯，引发持续十余年的战乱。