TITLE: Online math history lectures
QUESTION [22 upvotes]: This question is somewhat similar to this: Best online mathematics videos?
I'm using the word "history" loosely here. What I'm looking for are those lectures that put various mathematical developments in perspective by explaining their origins. There's something very insightful about seeing someone talk about the origins of a concept, that makes things click. Especially if he or she partook in the inception of that development.
So: where can I find such lectures online?

REPLY [3 votes]: I just came across these BBC podcasts the other day.  These are almost certainly more populist than you had in mind, but given the title of your question I thought I would throw it up here anyway.  The are ten podcasts.  Some expire in a day or so, which made me think posting it for those interested was a decent idea.

Newton and Leibniz
Leonard Euler
Joseph Fourier
Evariste Galois
Carl Friedrich Gauss 
The Mathematicians Who Helped Einstein
Georg Cantor 
Henri Poincare 
Hardy and Ramanujan 
10.Nicolas Bourbaki

http://www.bbc.co.uk/programmes/b00srz5b

"Professor of Mathematics Marcus du
  Sautoy reveals the personalities
  behind the calculations and argues
  that mathematics is the driving force
  behind modern science"