Several countries have in the past banned ruling queens, but 8 4, 8:05pm

Though they call them both queens as well, and the references are spotty, Wikipedia does seem to support the calling of Anna and Mary as kings:

https://en.wikipedia.org/wiki/Mary,_Queen_of_Hungary
https://en.wikipedia.org/wiki/Anna_Jagiellon (see Regnal Titles at the bottom)