“Huh? But she’s a girl. . . . Why?”
“Artoria Pendragon,” a voice that only Ayaka and Saber could hear rang out from the sky, as if in answer to her question. “That’s King Arthur’s real name, you know. Make sure you never write it on a history test, though; you won’t get credit for it.”
“Could this be . . .?”
“Yup. Part of the Holy Grail War that happened in Fuyuki. It was about 15 years ago, though. Man, you wouldn’t believe how lucky I am! You see, that lightning chariot just happened to break the castle’s wards back then. I got a look at three kings all together!”

Fate/Strange Fake: Volume 6, Chapter 20 ("Dream Becomes Reality")