I agree with the recommendation of the Sayers 'Wimsey' books!
Also, for historical whodunits set in solid real history, I must strongly recommend Ellis Peters' Brother Cadfael series. Set on the England/Wales border during the rivalry between King Stephen and Empress Maude, Cadfael is a former Crusader-then-sailor, who became a monk and herbalist as a retirement job. Because he has all manner of worldly experience, he is called upon as a sleuth and advisor. Twenty(-one) books in the series, all of them fascinating.
(The 21st, "A Rare Benedictine", is a volume of three backgrounding shortstories -- not part of the unfolding history of the series, but excellent grace notes.)
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Also, for historical whodunits set in solid real history, I must strongly recommend Ellis Peters' Brother Cadfael series. Set on the England/Wales border during the rivalry between King Stephen and Empress Maude, Cadfael is a former Crusader-then-sailor, who became a monk and herbalist as a retirement job. Because he has all manner of worldly experience, he is called upon as a sleuth and advisor. Twenty(-one) books in the series, all of them fascinating.
(The 21st, "A Rare Benedictine", is a volume of three backgrounding shortstories -- not part of the unfolding history of the series, but excellent grace notes.)