Historia Regum Britanniae

Geoffrey of Monmouth's "Historia Regum Britanniae" is a 12th-century work of pseudohistory that profoundly shaped the narrative of King Arthur and early British history.

The book presents a romanticized and largely fictional account of British kings, tracing their lineage back to Troy.

Geoffrey's work introduced many key elements of the Arthurian legend, including Arthur's parentage, his magical sword Excalibur, and his battles against Saxon invaders.

While not historically accurate, the "Historia Regum Britanniae" had a significant impact on subsequent literary and artistic representations of Arthur and his court.

Its influence on the development of Arthurian literature is undeniable.