A series of novels by writers Creator/MercedesLackey, Creator/EricFlint, and Creator/DavidFreer. They are HistoricalFantasy novels set in an alternate Venice in the 1530s. The point of divergence from our history (other than the addition of FunctionalMagic), was Hypatia being converted to Christianity and stopping the mob from destroying the Library of Alexandria, eventually splitting the Church into the Petrines, under her own and St. Peter's doctrine, and the Paulines, under St. Augustine and Paul's doctrine.

The first novel, ''Shadow of the Lion'', focuses primarily on the character of Marco Valdosta, heir to the presumed destroyed great house Valdosta of Venice. It borrows elements from ''RomeoAndJuliet'', for Marco falls in love with Katerina Montescue, last scion of the house that has feuded with Valdosta for two generations. In it, Marco, his half-brother Benito, their friends, and Prince Manfred and his bodyguard Erik of the Holy Roman Empire must defeat an invasion by Grand Duchy of Lithuania and Poland, headed by the demon Chernobog.

(Much of ''Shadow of the Lion'' is a fantasy reworking of Lackey's contributions to the science fiction shared-world "Literature/MerovingenNights" begun by Creator/CJCherryh, several passages taken almost word-for-word. Maria Garavelli and Caesare Aldanto start as [[{{Expy}} expies]] of Cherryh's characters Altair Jones and Thomas Mondragon, but diverge when [[spoiler:Caesare betrays Maria. Mondragon would've betrayed anyone ''else'' to protect Jones]]. Marco and Benito Valdosta are based on Lackey's Rigel and Deneb Takahashi.)

The second novel, ''This Rough Magic'', focuses on the characters of Maria Garvalli and Benito Valdosta, and borrows elements from the tale of Persephone (and Orpheus) from Greek mythology. Both characters find themselves in Corfu just as the island comes under siege by the Kingdom of Hungary.

The third novel, ''A Mankind Witch'', is a solo work by Freer. It follows the adventures of Prince Manfred and Erik between the events of the first two novels.

The fourth novel, ''Much Fall of Blood'', abandons the Valdostas and follows Manfred and Erik to Romania and Ukraine (but under different names in-novel).

The fifth novel, ''Burdens of the Dead''. It returns to Marco, Kat and Benito Valdosta, and Maria Verelli (nee Gariavelli). It follows the invasion of Constantinople by Venice, led by Benito, and the kidnapping of Benito and Maria's daughter. It takes place concurrently with the events of ''Much Fall of Blood''

!!These novels provide examples of:

* AccidentalProposal: Erik in ''Much Fall of Blood'' offers Bortai shelter when he sees her pursuers. But he used a phrase that offered her his tent, which in her culture was a proposal of marriage.
* AntiVillain: Count Mindaug. Smart, learned. "He needed power—preferably great power—simply because he could ill afford to let anyone else have it."
* ArmorIsUseless: Subverted. The Knights of the Holy Trinity wear archaic heavy armour, which everyone admits is not too useful with plenty of firearms around. However, it is still a very useful defence against magical forces, which they regularly fight against.
* ArrangedMarriage: Marco Valdosta and Angelina Dorma. It doesn't work.
* TheAtoner: Fortunato Bespi.
* BadassPrincess: Bortai.
* TheBerserker: Erik is capable of entering this state, but once there can't tell friend from foe, so prefers not to do so when allies, particularly Prince Manfred, are around.
* BoisterousBruiser: Manfred.
* BelligerentSexualTension: Between Benito and Maria.
* BloodBath: The character Elizabeth Bartholdi bathes in blood to keep herself eternally young in an attempt to avoid the price of her deal with the Devil.
* BloodMagic: The ritual to summon the Winged Lion requires the sacrifice of life. [[spoiler: In Marco's case, just being willing to end his own life was enough.]]
* ChosenOne: Marco.
* CoitusUninterruptus: How Francesca saves Erik and Manfred from the [[CopsAndDetectives schiopettieri]].
* CrowdSong: In the battle against Emeric in the end of ''Much Fall of Blood''.
* DeliberateInjuryGambit: Marco faces a better fighter with a longer reach in a knife fight. He wins by ''impaling his own left hand'' on the blade of his opponent's dagger, rendering it useless and allowing him to slay the man.
* EvilMentor: Caesare Aldanto to Benito. [[spoiler: He helped kill the Valdosta boys' mother and only helps them because of the money he gets from their grandfather. He's a ruthless assassin and plotting to help the city fall to the coming invasion.]]
* FakeOutMakeOut: With [[AThreesomeIsManly Erik, Manfred, and Francesca]]. [[spoiler:There was '''nothing''' fake about it, either.]]
* HeroicBSOD: Erik, after [[spoiler:Svanhild is killed]].
* HighClassCallGirl: Francesca, although she trades up to Imperial Advisor the second she gets the opportunity.
* HistoricalFantasy / AlternateHistory
* HoistbyHisOwnPetard: Several examples. Most dramatically by Elizbeth Bartholdy [[spoiler: whose ritual to strip away Drac and his sisters magical protections stripped away her own making her VERY mortal.]]
** Ceasare has a more subtle one [[spoiler: one of the subplots was implied that a smuggling scheme concerning ship caulking was used to sabotage Venice's shipping. Its than implied that Ceasres escape vessel had the same flaw which lead to its sinking and his own comeuppance.]]
* IgnoreTheFanservice: The biggest reason Lucretia wants Eneko and Marco dead.
* ImmortalityImmorality: Countess Elizabeth Bartholdy.
* {{Jerkass}}: Caesare.
* LaserGuidedKarma: Caesare ends up [[spoiler: shipwrecked by one of the ships he helped sabotage.]] What happens to him next is more of a KickTheSonOfABitch from Chernobog.
* LeParkour: Benito's favourite way of getting around in Venice.
* LiteraryAllusionTitle: Each title is part of a line from Creator/WilliamShakespeare - e.g. ''This Rough magic'' from ''The Tempest'' and ''Much Fall of Blood'' from ''Macbeth''.
* LoveAcrossBattlelines: Kat and Marco in ''The Shadow of the Lion''. Their subplot includes several {{Shout Out}}s to ''RomeoAndJuliet''.
* LoveAtFirstSight: Kat and Marco. Erik and Svanhild.
* LowFantasy
* MarriageToAGod: Maria and Aidoneus.
* MusicForCourage: Used several times, mostly with battle hymns. The most notable example is in the final battle against Emeric in ''Much Fall of Blood''.
* NobleFugitive: Plenty. Marco and Benito in ''The Shadow of the Lion''. Vlad, Bortai, and their respective sister and brother in ''Much Fall of Blood''.
* NoImmortalInertia: [[spoiler:Elizabeth Bartholdy]]. Somewhat justified in that the immortality treatment had to be maintained at regular intervals.
* OrpheanRescue: [[spoiler: Benito for Maria]] in ''This Rough Magic''. He one-ups Orpheus in resisting the temptation to look back by following his other companion, a knight [[spoiler: who is wearing shiny, mirror-like armor; letting him see that Maria is behind him without having to look.]]
* OurWerewolvesAreDifferent: In ''Much Fall of Blood'', they are the result of a willing sacrifice between man, wolves, and natural forces, and fully in control of themselves and the transformation. An ''involuntary'' sacrifice will generate ''loup garou'', who hungered for blood and were hard to kill.
* RagsToRoyalty: Marco and Benito in ''The Shadow of the Lion''.
** Although technically they were born to nobility, so Riches to Rags to Riches.
* RewardedAsATraitorDeserves: A common man is coerced into betraying the guerrilla fighters led by Erik when Caesare and the Shaman kidnap his young son. When they outsmart the trap and find out the man's son was killed (and ''eaten'' by the Shaman in his dog form), they give him the gnawed on thigh bone and tell him to spread the word about what the invaders do to children. This, in turn, helps raise up the populace against the invaders and [[HoistByHisOwnPetard drive them out]].
* RoaringRampageOfRevenge: What Benito is about to go on in the end of ''This Rough Magic''.
* SilkHidingSteel: Katerina and Francesca.
* SlidingScaleOfAlternateHistoryPlausibility: Type X (Fantastical Alternate History), and due to the large scale of the change and how long ago it happened, probably a type II (Hard/Soft Alternate History) when the series start, mainly due to good research.
* TheSneakyGuy: Benito Valdosta.
* TheStoic: Erik.
* {{Tsundere}}: Maria, very much so.
* SorcerousOverlord: Jagellion of Lithuania/Chernobog
* SuddenPrincipledStand: How Erik saves Kat in ''The Shadow of the Lion''.
* WordOfSaintPaul: In-universe, Christianity gained another early high-powered missionary and organiser in Hypatia, and thus split into two groups, based on different Words of Saint Paul: the Pauline branch and the Petrine branch.
* YourMom: ''Your mother is a tortoise''. Subverted when it's made into a running gag in ''Much Fall of Blood''. And again at the very end of ''Burdens of the Dead''.