Lady Jane Gray and Diane de Poitiers were alive at the same time.

Ladies, I've been asked to look at:

Christine de Pizan

https://en.wikipedia.org/wiki/Christine_de_Pizan

Beatrice d'Este

https://en.wikipedia.org/wiki/Beatrice_d'Este

Diane de Poitiers 

https://en.wikipedia.org/wiki/Diane_de_Poitiers

Lady Jane Grey - Wikipedia

https://en.wikipedia.org/wiki/Lady_Jane_Grey

Isabella Clara Eugenia 

https://en.wikipedia.org/wiki/Isabella_Clara_Eugenia

Elisabetta Sirani

https://en.wikipedia.org/wiki/Elisabetta_Sirani