Morgana said gently, her thoughts full of grief and understanding, Never castigate yourself, Brenna of Clan McEgan for trying to spare the lives of innocents before moving to strike the guilty. To do otherwise is to become as he is, mad with hatred and the desire for vengeance. There are many great injustices in life—that, at least, has not changed over the centuries. We shall simply do our best to see that your world's injustices do not add to mine.

Brenna could not ask for anything more.

Covianna Nim watched in deep satisfaction as Morgana rode out the gates of the Sixth Legion's fortress of Caerleul, on her way to commit treason—a circumstance that Covianna found utterly delicious. Once certain that Morgana and her fool of a nephew were truly gone, she returned to her own room, where her clothing and satchels of herbs and other substances—poisons with far darker uses than mere healing—sat waiting for her own departure.

She pulled from her baggage a small, flat packet in which she kept a precious supply of thin-scraped vellum, calfskin as pale as the skin of a white onion, with a far smoother surface. She chose a smallish piece, trimmed from a larger vellum she had written while in Caer-Iudeu, and set it on the table beside her borrowed bed. Mixing a small amount of ink from a powdered base, using a few splashes of white wine—the best liquid for producing a fine writing ink—Covianna trimmed her goose-quill pen, tapped her lips with the feathered end of the shaft, then dipped and began to write.

Artorius, she began, using the beautifully scripted, cursive Latin she had learned as a girl from her dearly beloved Marguase—it pains me enormously to be the bearer of ill tidings, but my concern for the safety of Britain impels me to send you this warning. It is, perhaps, a symptom of some inherited madness, but Morgana has lost all reason. She has made secret arrangements to betray Galwyddel to the Irish of Dalriada.

I heard her, with my own ears, plotting to secure for Medraut the throne of Galwyddel, which he will earn by betraying you and all of Britain. It is the form of this betrayal which distresses me so deeply. He is to marry a princess of Irish blood, a marriage Morgana is negotiating to bring about. As soon as the marriage is consummated, he will invite in her Dalriadan kinsmen as foederati.

My heart grieves that this is so, for I believe Morgana truly thinks this insanity to be the right thing to do. It is clear to me, at least, that the Dalriadans will take full advantage of our distraction in the south and invade at full strength the moment she has concluded this mad treaty. Please, for the sake of Britain, ride to Caer-Birrenswark and stop her before she commits this act of desperate folly.

I will ask a minstrel to deliver this into your hand, as I must ride south with all haste to help my own kinsmen at Glastenning Tor prepare for defense—for if the Saxons break through our lines at Caer-Badonicus, they will surely strike next at the Tor. I pray that you do not blame Morgana too deeply, for I believe the shock of her husband's death has left her so deeply shaken, she is not in her right mind. Treat her gently, I beg of you, but halt this madness before it is too late for Galwyddel and all of Britain. I am, humbly, your obedient servant, Covianna Nim of Glastenning Tor.

She carefully blew the final lines of ink dry, disposed of the excess ink by pouring it into the chamber pot, and rinsed the little glass inkwell with water from her basin before carefully storing it away again in her baggage, along with the quill in its pen case and the penknife in a second case tucked inside the first. She lit a taper of beeswax from an oil lamp, then creased the vellum into a small square, so that all sides were sealed by folds.

Covianna dripped melted wax onto the final, open edge and pressed her ring into it, leaving an impression of Glastenning Tor's heraldic symbol: a labyrinth with a sword at the center. Blowing out the candle flame, she sat back and surveyed her handiwork. A small, satisfied smile chased its way across her lips. She laughed softly, a low and sultry sound, then tucked the note into the sleeve of her gown and went in search of a minstrel who could be trusted to do exactly what he was instructed to do, no more and no less. She had made use of him before, a time or two, and had found him to be quite reliable. His eyes lit like bonfires at Beltane when he saw her.

"Covianna Nim!"

She allowed him to kiss her fingertips.

"Bricriu, I would have you deliver this note to Artorius after I have gone. But do not take it straight to him. I must try and verify the matters written herein. If I do not contact you by the next full moon, then the matter is true and Artorius must know of it."

She handed the small, folded vellum over—and with it a coin glittering golden in the late and slanting light of afternoon. A gold aureus of Rome, it bore the portrait of the last emperor of the west, Romulus Augustulus. Twenty-five years after their last minting, the golden Augustulus coins still circulated amongst the peoples of the vanishing empire, even as far afield as Britain, which still managed a lively trade with her former imperial masters despite unrest, civil war, and invasion that seemed to sweeping across the entire known world.

Covianna, brought up in a tribe of artisans who were also shrewd traders, had learned the value of such coins almost before she could walk. She had acquired a goodly collection of the aureus coins over the years, which she made excellent use of from time to time. When she held up the glittering golden disc, worth a hundred silver sestertii and twice the value of Constantine the Great's gold solidus, and caught the answering glint in the minstrel's eye, she knew she had him.

"Agree to follow my instructions to the letter," she purred, "and this will be yours immediately. Breathe not one single word of this to anyone, not even to your fellow minstrels or bedmate, but give it straight into Artorius' hand, and I will provide others. Multiple others. Once you have given it to Artorius, bring his response to me at Glastenning Tor—and ride like wildfire, for time will be critical by then." As she spoke, Covianna turned the coin over and over in her fingers, toying with it, watching in amusement the way the minstrel's eyes followed the glitter of light. She flipped it to him without warning.

He caught it with a snatch like a starving dog, turning it over and staring at it while babbling, "I swear by Afallach and Christ, I will put your letter into the Dux Bellorum's own hand and no other's, even if I must ride to Avalonis across the waves and back again." He slipped the coin into his belt pouch, then held out his hand for the note. "Provided I have not heard otherwise from you, come the full moon, the task will be done."

Satisfied, Covianna slipped the letter into his palm and it vanished up his sleeve. "Do this for me quietly and you will be rewarded accordingly."

"Your servant," he bowed.

Covianna left him whistling merrily and retrieved her satchels, carrying them across the road and giving them to a stable hand to pack behind her saddle. Emrys Myrddin appeared in the doorway as she was making her way back to the street.

"Covianna," Myrddin smiled, eyes brightening when his gaze rested on her. "Where will you go, in all this turmoil and confusion? Back to Gododdin?"

"No," she said in a low voice, giving him a look of grave concern. "With war brewing in the south and my kinsmen at Glastenning Tor considered one of the most lucrative targets on the Saxons' list, I will be needed there far more than at Gododdin."

"You need not risk yourself," he protested, twisting a strand of her golden hair around his fingertips.