The Cloister and the Hearth by Charles Reade

Set in the 15th century, this historical novel tells the story of a young Dutch artist named Gerard Eliassoen, who abandons his lover, Margaret, and their children to become a Dominican friar, while she, believing him dead, becomes a nun. The narrative follows Gerard's adventures across Europe, his struggles with his faith, and his eventual reunion with Margaret. The novel explores themes of love, faith, and duty, and provides a vivid depiction of medieval life.