Narrator
The narrator, presumably the voice of Millay herself, is present in all seven of the poems. In some of them the narrator addresses a more general audience while in others, she speaks to a specific person.
Audience
The audience is the both the "you" and the unspoken listener that Millay's narrator adresses in the seven poems. As a character, it is able to be interpreted as both the reader and a specific person the narrator is addressing who they may know more intimately. In many cases, it seems like Millay's narrator is talking to a lover or a friend while simultaneously addressing the audience.
Guinevere
Guinevere is the wife of King Arthur and the Queen of Camelot. Lancelot of the lake, her husband's most successful knight, is in love with her and in some versions of the story they have an affair.
Isolde
Isolde of Ireland is the daughter of King Anguish of Ireland and Queen Iseult. She and Tristan fall in love after the both accidentally drink a love potion and they have an affair that gets Tristan banished.
"She"
In the poem "When the Year Grows Old," the narrator refers to a "she" throughout the poem. This "she" appears to be either a former friend or lover of the narrator's.