Ancient Rome
Lindsey Davis
The Falco series:
The Silver Pigs (1989)
Shadows in Bronze (1990)
Venus in Copper (1991)
The Iron Hand of Mars (1992)
Poseidon's Gold (1993)
Last Act in Palmyra (1994)
Time to Depart (1995)
A Dying Light in Corduba (1996)
Three Hands in the Fountain (1997)
Two for the Lions (1998)
One Virgin Too Many (1999
Ode to a Banker (2000)
A Body in the Bath House (2001)
The Jupiter Myth (2002)
The Accusers (2003)
Scandal Takes a Holiday (2004)
See Delphi and Die (2005)
Saturnalia (2007)
( and the one I have not read yet) Alexandria (2009)
70AD: Falco, the principal character is a lower class "informer". Fun read with some action, romance, and irony.
Medieval Europe
Ellis Peters (Edith Pargeter)
Cadfael
1. A Morbid Taste for Bones (1977)
2. One Corpse Too Many (1979)
3. Monk's Hood (1980)
4. St. Peter's Fair (1981)
5. The Leper of Saint Giles (1981)
6. The Virgin in the Ice (1982)
7. The Sanctuary Sparrow (1982)
8. The Devil's Novice (1983)
9. Dead Man's Ransom (1984)
10. The Pilgrim of Hate (1984)
11. An Excellent Mystery (1985)
12. The Raven in the Foregate (1986)
13. The Rose Rent (1986)
14. The Hermit of Eyton Forest (1987)
15. The Confession of Brother Haluin (1988)
16. The Heretic's Apprentice (1989)
17. The Potter's Field (1989)
18. The Summer of the Danes (1991)
19. The Holy Thief (1992)
20. Brother Cadfael's Penance (1994)
A Rare Benedictine: The Advent of Brother Cadfael (1988)
The First Cadfael Omnibus (omnibus) (1990)
The Second Cadfael Omnibus (omnibus) (1991)
The Third Cadfael Omnibus (omnibus) (1992)
The Fourth Cadfael Omnibus (omnibus) (1993)
The Fifth Cadfael Omnibus (omnibus) (1994)
The Sixth Cadfael Omnibus (omnibus) (1996)
The Seventh Cadfael Omnibus (omnibus) (1997)
12th c. Brother Cadfael, ex Crusaider, now turned Benedictine monk.
Marston, Edward
Owls of Gloucester (2000)
Foxes of Warwick (1999)
The Wildcats of Exeter (1998)
The Hawks of Delamere (1997)
The Stallions of Woodstock (1999)
The Serpents of Harbledown (1998)
The Lions of the North (1996)
The Ravens of Blackwater (1994)
The Wolves of Savernake (1993)
William I, 1066-1087:Domesday Chronicles: Gervase Bret and Ralph Delchard
Italian Renaissance
Eyre, Elizabeth
Death of the Duchess (1992)
Poison for the Prince (1993)
Curtains for the Cardinal (1993)
Dirge for a Doge (1996)
Sigismondo series
Elizabethan
There are lots of mysteries set in Elizabethan times.
Marston, Edward
The Princess of Denmark (2006)
The Malevolent Comey (2005)
The Vagabond Clown (2003)
The Bawdy Basket (2002)
The Frost Fair (2002)
Fair Maid of Bohemia (1997)
The Roaring Boy (2002)
The Devil’s Apprentice (2001)
The Wanton Angel (1999)
The Laughing Hangman (1996)
The Silent Woman (1994)
The Mad Courtesan (1992)
The Nine Giants (1991)
The Merry Devils (1990)
The Trip to Jerusalem (1990)
The Queen’s Head (1988)
Nick
Buckley, Fiona
Pawn for a Queen (2002)
The Siren Queen (2004)
The Fugitive Queen (2003)
Queen of Ambition (2002)
Queen’s Ransom (2000)
To Ruin a Queen (2000)
The Doublet Affair (1998)
The Shield the Queen (1997)
Ursula Blanchard
Harper, Karen
The Hooded Hawke (2007)
The Fatal Fashione (2006)
Queen Liz
Emerson, Kathy Lynn
Face Down O’er the Border
Susanna, Lady Appleton
Marston, Edward
Owls of Gloucester (2000)
Foxes of Warwick (1999)
The Wildcats of Exeter (1998)
The Hawks of Delamere (1997)
The Stallions of Woodstock (1999)
The Serpents of Harbledown (1998)
The Lions of the North (1996)
The Ravens of Blackwater (1994)
The Wolves of Savernake (1993)
William I, 1066-1087:Domesday Chronicles: Gervase Bret and Ralph Delchard