Princess Gráinne.

Imposing the geis of betrayal on him, the perpetrator who caused him to fall from the position of a glorious hero to that of a refugee. However, Diarmuid never resented her.

Without any other reason, even if it were a passion which was solely due to captivation from the Mystic Face of the hero, her choice of running away from the seat of Micuart's banquet for this sake was a decision that, as far as the lady is concerned, was at the risk of her life.

The ties with her relatives, the pride of the princess, and also the promised glory of the future......Turning her back to everything, Gráinne chose the pathway of love with Diarmuid. If that beginning was because of the mystical force of his charm, the day when she would doubt her love would probably come. Nevertheless, without any fear towards such a future, Gráinne continued her way of life with love.

- Fate/Zero: Act 8, Part 1