Character Analysis
This Scottish "saint" is a sort of Merlyn-lite for the G-boys. He's a kind of heretic, drinks copiously, and ends up breaking his vows of chastity and marries Mother Morlan.
St. Toirdealbhach makes his living by copying and illuminating manuscripts. He's the only source of learning for the G-boys, and serves as their only real civilizing influence (for all the good it does them).