She died after giving birth to her baby.
There is great controversy involving who Queen Guinevere was and when she died. The most common accepted story is that Queen Guinevere died shortly after King Arthur. Lancelot, when he heard of King Arthur's passing, traveled to see Guinevere and learned that she had passed away as well. After burying her next to King Arthur, Lancelot killed himself.
She was a queen.
no
She stopped breathing? Sorry, couldn't resist. In Malory's Morte, Guinevere died of natural causes. She had be cloistered as a nun for some years after Arthur's passing. Lancelot died not long after his Queen.
Camelot
Lancelot
Guinevere
Lancelot was a legendary knight of the round table and lover of Queen Guinevere.
Queen Guinevere.
A.D. 960
yes
King Arthur