Brother Cadfael is the fictional main character in a series of historical murder mysteries written between 1977 and 1994 by the linguist-scholar Edith Pargeter under the name "Ellis Peters". The Crusader-turned-Monk uses his botanical knowledge to solve mysteries in the old Norman England town of Shrewsbury.
Columbo. The first two and maybe three seasons were absolute TV classics. The later ones were a little bit tame and the character of Columbo seemed to lose some of his more quirky habits which made the first seasons so memorable. Great TV mysteries though with a twist: You knew who the murderer was, but how would Columbo nail him?
Edith Pargeter who wrote under the pseudonym Ellis Peters. She wrote a series of short series with the main character Brother Cadfael ("A good man in an evil world") who lives in a monastery in Shrewsbury England in the 1100s. He was the "Columbo" or Sherlock Holmes of his time helping the local law enforcement solve crimes using faith & logic.