Anton Schindler
Austrian biographer, 1795-1864
"Anton Felix Schindler was an associate, secretary, and early biographer of Ludwig van Beethoven. In 1840, his biography of Beethoven was published in Münster. Later editions appeared in 1845, 1860 and 1871. Although the inconsistencies of Schindler's account of Beethoven's life were clear as early as the 1850s, it was a series of musicological articles published since the 1970s that essentially destroyed Schindler's reputation of reliability. It was demonstrated that Schindler had falsified entries in Beethoven's Conversation Books and that he had exaggerated his period of close association with Beethoven (his claimed ""11 or 12 years"" was probably no more than five or six)."
Source: Wikipedia