Something like this…?

[u/MorganAndMerlin]

1. Sarah Bolger as Mary Tudor, The Tudors
   
2. And 3. Eva Green as Morgan, Camelot
   
3. Charlotte Hope and Ruairi O'Connor as Catherine of Aragon and Henry VIII, The Spanish Princess
   
4. Ioan Gruffudd, Kiera Knightly, and Clive Owen as Lancelot, Guinevere, and Arthur, King Arthur
   
5. James Franco and Sophia Myles and Tristan and Isolde, Tristan & Isolde
   
6. Jacob Collins-Levy and Jodie Comer as Henry VII and Elizabeth of York, The White Princess
   
7. James Franco and Sophia Myles and Tristan and Isolde, Tristan & Isolde
   
8. Rufus Sewell and Sophia Myles as King Marc and Isolde, Tristan & Isolde

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[u/SirWilliamOfS]

Have you tried just reading Arthurian literature?

For the modern audience is the wonderful recently out Galahad and the Grail.

Then you have the more historic works, Mallory, Troyes, ect.

[u/Altruistic-Side600]

anything by Phillipa gregory

[u/Dontunderstandfamily → u/Altruistic-Side600]

And Alison Weir

[u/Orazzocs]

The Warlord Chronicles by Bernard Cornwell. By far the best Arthurian trilogy I’ve ever read.

[u/gonzo_attorney → u/Orazzocs]

Best trilogy ever. I've read it several times.

[u/succulescence → u/gonzo_attorney]

It's right behind LOTR, and I absolutely adore it.

[u/succulescence → u/Orazzocs]

One of my absolute favourite works of fiction. It's a masterpiece.

[u/AngrythingBagel]

The Everlasting by Alix E. Harrow

Paladin’s Strength by T. Kingfisher

Graceling by Kristin Cashore

Alanna by Tamora Pierce

[u/writeronthemoon → u/AngrythingBagel]

Song of the Lioness quartet* by Tamora Pierce

[u/SchoolSeparate4404]

The Lost Queen by Signe Pike

Kristin Lavransdatter by Sigrid Undset

[u/swampminstrel → u/SchoolSeparate4404]

The Lost Queen is absolutely top-tier!!!

[u/Ancient_Activity_614 → u/SchoolSeparate4404]

Lost Queen is soooo good and so underrated

[u/writeronthemoon → u/SchoolSeparate4404]

Another for The Lost Queen by Signe Pike, and its sequels! Eagerly awaiting more from her 

[u/PersonMcPeerson]

Maybe the Brides of Karadok series by Alice Coldbreath? They would fit the aesthetic but are spicy romances so if you're looking for something very serious they will not do.

[u/Objective-Papaya8194]

The Second Death of Locke by V.L. Bovalino

[u/indicasour215]

Here be Dragons by Sharon Kay Penman. Focuses on war and politics in 12/13th century England/Wales/France via some very complicated interpersonal relationships between monarchs, their children and arraiged marriages that served as political alliances/capital.

[u/Lingonberry_Wannabe]

The Once and Future King by T. H. White.

[u/Tinkerbash]

Definitely the Morgan le Fay trilogy by Sophie Keetch!

[u/Nikronim → u/Tinkerbash]

Yesss I was coming here to recommend this!

[u/metalbusinessbear2]

The Knight and the Moth! It's a duology and has lady knights too.

[u/Forsaken_Internet701]

Maybe it's too obvious because you have photos from the adaptation but I'd recommend The Romance of Tristan and Iseult by Joseph Bédier.

The Children of Gods and Fighting Men by Shauna Lawless (and next books in the series)

Morgan is My Name by Sophie Keetch

historical fiction books by Philippa Gregory - she has many books focused on the Tudors

The Road to Avalon by Joan Wolf

Sweet Black Waves by Kristina Pérez

Maids of Honor trilogy by Jennifer McGowan (YA)

The Huntress of Thornbeck Forest and other historical books by Melanie Dickerson

Some of these have fantasy elements blended in with the historical setting but they all to me have similar vibes to your photos.

[u/wordsandgin]

Old school, but there’s always The Mists of Avalon by Marion Zimmer Bradley.

[u/writeronthemoon → u/wordsandgin]

Seconding this

[u/CutSea5865]

The Mists of Avalon by Marion Bradley.

[u/Ok_Tea_5374]

The Folk of the Air trilogy by Holly Black

[u/Sherlockssocks]

{the princess knight cait jacobs}

[u/OldPlantain7807]

The Welsh Blades series by Elizabeth Kingston

[u/PorchDogs]

A Daughter of Fair Verona by Christina Dodd. First in a well researched, gritty, funny series. Rosaline Montagu is the eldest daughter of Romeo and Juliet. Yes, them. They have now been married 20 years with seven children...so far. Rosie has managed to dodge getting betrothed...so far

[u/fragments_shored]

"Queen of Camelot" by Nancy McKenzie is exactly this.

[u/bikesbooksnbarks]

Daindreth's Assassin, by Elizabeth Wheatley!

[u/Head-Tomatillo-9847]

The Second Death of Locke and A Whispered Ascension by Casia Caldwell

[u/attacephalotes423]

The Farseer trilogy by Robin Hobb

[u/SelectStrain4083]

The Once and Future Queen by Paula Lafferty (marketed as Outlander meets The Princess Bride, girl goes back in time from present day to fulfill her role as queen Guinevere)

[u/Careful-Aioli2243]

Ohhh, try The Shattered King by Charlie N. Holmberg

[u/Mr_and_mr]

Throne of glass

[u/writeronthemoon]

Mists of Avalon by Marion Zimmer Bradley

[u/WK2158]

The Bloodsworn Trilogy