The first one is how Arthur, Lancelot and Guinevere meet.
The second is a long one and explores Tancred’s life.
Here is a short story for Arthur.
It’s called – Arthur’s Heart
It explores Arthur’s life without Lancelot. It takes place during the beginning of Lancelot’s Burden, so there are a few spoliers, though nothing terrible! However, you might want to wait for the next books before reading it, depends on how you feel about spoilers. It opens when Arthur finally loses all his connections with Lancelot and tries to show us how he feels now he’s lost his Wolf. I feel for Arthur and have done the longer the series continues, so I’m hoping to redress the balance a little with a few of these…