Banner of the Kings of Sicily under the House of Hohenstaufen.
Manfred, King of Sicily (r. 1258-1266) is known to have changed the field of the royal coat of arms to argent.

Some  Nuova Cronica mss. illustrations of the early 14th century show military banners with the design alongside the coat of arms (e.g. ms. Chigiano L VIII 296.
King Manfred of Sicily Arms.svg
Roberto Breschi. Sicilia (in it). rbvex.it. Roberto Breschi Editore. Retrieved on July 24 2011.
Giacomo C. Bascapè; Marcello Del Piazzo, Luigi Borgia (1983)    (in Italian)   Insegne e simboli: araldica pubblica e privata medievale e moderna, Rome:  Pubblicazioni degli Archivi di Stato: Ministero per i beni culturali e ambientali Ufficio centrale per i beni archivistici
King Manfred of Sicily Arms.svg: Heralder
derivative work: The White Lion