Uther and Igraine by Warwick Deeping

Radamanth the goldsmith had not wasted the hours since his niece had fled Winchester and his house in the dark. He was a man who did not let an enterprise slip into the limbo of the past till he had attempted honestly, and dishonestly, for that matter, to bring it to a successful issue. He had set his heart on getting Igraine married to one of the first lords in the island, and he also had skew ideas as to brimming up his own coffers. Taking it for granted that Lilith and the girl had not been close friends for weeks together without sharing secrets, and being also strongly of the opinion that Igraine's perversity arose out of some previous affair, he laid methodical siege to his daughter's confidences, and cast a parental dyke about her that should compel her to open every gate and alley to his scrutiny.

Lilith, amiable, but weak as milk, was soon worn into surrender by her father's methods. He had an unfailing lash wherewith to quicken her apprehension, in that young Mark, the armourer's son, should be barred the house unless she bent to the parental edicts. Lilith soon brought herself to believe that after all there could not be so much disloyalty in telling certain of Igraine's adventures to her father. Radamanth, bit by bit, had the whole tale of the way from Avangel to Winchester. Seeing how often Igraine -- woman-wise -- had pictured her man to Lilith, the goldsmith won a clear perception of the strange knight's person, how he rode a black horse, wore red armour, bore a red dragon on a green shield, and was called Pelleas. Radamanth made a careful note of all these things, and laid the knowledge of them before Gorlois. Various subtleties resulted from these facts -- subtleties carefully considered to catch Igraine.