"The Oera Linda Book, from a Manuscript of the Thirteenth Century" by J. G. Ottema et al. is a manuscript first published in 1872. Written in imitated Old Frisian, it claims to document historical and mythological events from 2194 BCE to 803 CE. Scholars consider it a hoax, yet controversy erupted in the 1860s and resurfaced during 1930s Nazi occultism, when it became known as "Himmler's Bible." The manuscript's true author and intent remain unknown, sparking debates about authenticity, nationalism, and ancient mysteries that continue in modern esoteric circles.