Russian help needed. PLEASE!

This isn't a tennis matter, but it is a question about Russia and where better to ask.:) .
I'm doing a project in college on the politics of the early 20th century (its a VERY boring project). Anyway, I got to the 'Russia section' in a book, and it mentioned 2 words and it didn't explain what they meant, and I have no idea.
The words are:
Duma
Kremlin
What do they mean?
Any help would be very much apprieciated:D .

I am not russian but the duma is the russian parliament and the kremlin is like a big place that has a cathedral and other things in it and is sourrnded by a big wall (i think)

Bezza,
very precise description. Historically, kremlin was meant to be a
fortress of fully-functional town - with cathedral, governmental
structures and some other facilities.

In this context I guess word "Kremlin" means executive authority.

Thank you all:D .