On first and second blush, this film of history’s greatest “cat fight” would appear to have a contender or two in its cast.

Saoirse? Margot?

Stage director Josie Rourke, making her feature film directing debut, certainly knows a thing or two about working with actresses. That’s got to be a help when your stars are playing two of history’s greatest divas.

“Mary Queen of Scots” opens Dec. 7.