The Cadfael Chronicles is a series of historical murder mysteries written by the English author Edith Pargeter (1913–1995) under the name Ellis Peters. Set in the 12th century in England during the Anarchy, the novels focus on a Welsh Benedictine monk, Cadfael, who aids the law by investigating and solving murders. In all, Pargeter wrote twenty Cadfael novels between 1977 and 1994, plus one book of short stories. Each draws on the storyline, characters and developments of the previous books in the series. Pargeter planned the 20th novel, Brother Cadfael's Penance, as the final book of the series, and it brings together the loose story ends into a tidy conclusion. Pargeter herself died shortly after its publication, following a long illness. Many of the books have been adapted as radio episodes, in which Ray Smith, Glyn Houston and subsequently Philip Madoc played the titular character. An ITV television series was also developed from the books, which starred Derek Jacobi as Cadfael. Pargeter's Cadfael Chronicles have been credited for popularizing the genre of historical mystery novels. Source: Wikipedia (en)