Catherine the Great of Russia, was she the inspiration?

I know it sounds maybe strange, but a while ago I saw a documentary on Catherine the Grerat of Russia, and it struck me how similar the plots of Queen Anne is to Catherine the Great's story.

Catherine was German and was sent with her mother to the Russian court as a suitable wife for the oncoming tzar. He was a little retarded, but she was intelligent. They get married, but dislike each other and they don't have sufficient intercourse to make a baby. So they introduce her to a young Polish duke. They have an affair and have a child. He gets sent away. She has a profound friendship with the British amabassador, and even sells state secrets during the war with England. She almost got cought, but plays it so that she walks free...
The people is aggravated more and more with the new tzar and the situation becomes critical. In the mean time Caterine has seen a musketeer and they start an affair. He has two brothers. One is the brains, one is a good fighter, etc. Can't remember what the last one was. They make sure she becomes tzarina, and that the people doesn't think anymore about the nephew of the captured tzar, who is locked up in prison because he was the rightful heir.
Orloff (the musketeer) and she have a child as well, but she gets tired of him. In the mean time her husband 'dies' of a 'fever'... In fact, murdered by one of the Orloffs (the three musketeers).
Then she sets eyes on another man. He was more intelligent and she could talk to him. She marries him in seret, but never makes it public, because she wants to keep her power, and otherwise she would have to hand it over to her husband, him being the man.
The relationship becomes difficult, but they stay together. She sends him on campaign and eventually he dies of some disease and she is distraught.

The three musketeers Orloff, each one having a certain good quality, the profound friendship with the British ambassador, the secret marriage... iIcouldn't help thinking about the documentary. On top of that Anne in the book is saddled, not with a retarded king, but with a king who is at least stupid and useless. Remember how he gets bored on the battle field at Rochelle? The country is in a dangerous position, and what does he do, 'he is bored'... How can you get bored in that situation :confused:. You should give your people guidance.
Does anyone know whether Dumas got his inspiratin for Anne with Catherine the Great? Otr is it ust a dream of mine?