Throughout the Lais of Marie de France there are several themes presented as central to the various stories. Some of these themes are present in all of the lais. One such example is that of courtly love and it"s implications. Courtly love being one of the more prominent themes in all of medieval literature, it is fittingly manifested in all of the lais as well. Another theme present in two of the lais is isolation. The theme of isolation plays a large role in the stories of Guigemar and Lanval. In each of these lais we see isolation as a factor in determining the fates of the central figures. Within each lai isolation is represented on several different occasions, each time having a direct impact on the outcome. These instances of isolation may be seen at times to be similar in nature and consequence, and different at other times. By sifting through both works these instances may be extrapolated and analyzed. .

             In general, isolation seems to be harmful to both of the heroes. One very good example of this is toward the beginning of Guigemar"s tale. "They gathered in pursuit of a large stag and the hounds were released. The hunters ran in front and the young man lingered behind." (p.44) It is only when Guigemar is alone that he sees the mysterious doe with the antlers of a stag and a fawn. This creature also serves as a signpost telling us that Guigemar has crossed over from this world into the realm of Fairy and magic. It is this encounter with the animal that wounds Guigemar with an injury only love can heal. Directly after this we see another, more ironic example of isolation. Because he has been wounded Guigemar wants the aid of his friends. "My friend, ride quickly and bring my companions back, for I should like to speak to them." (P.45) By ordering his servant to go and fetch help Guigemar found himself alone again. "The young man rode off and Guigemar remained behind, lamenting his suffering.