Born of Guan Yu, and Dying of Him
The novel makes Zhou Cang a former Yellow Turban who submitted to Guan Yu and stayed inseparable from him ever after, bearing his blade and leading his horse through campaigns north and south. When Guan Yu was defeated at Maicheng and killed, Zhou Cang, seeing it from the wall, cut his own throat in grief and rage — a wholly fictional figure who won a near-"real" standing in folk faith, so that in Lord Guan temples everywhere the grouping of "Zhou Cang bearing the seal, Guan Ping holding the blade" has become all but standard, better known than not a few genuine historical figures.