Section 6.7 History

This is one of the best all around sites that I have found. It is titled "The MacTutor History of Mathematics Archive."
http://www-history.mcs.st-and.ac.uk/~history/

This is an award-winning site that links to all sorts of mathematics information.
http://archives.math.utk.edu/

Here are the biographical sites related to this section:

Euclid:
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Euclid.html

Proclus:
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Proclus.html

Legendre:
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Legendre.html

Bolyai:
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Bolyai.html

Playfair:
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Playfair.html

Lambert:
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Lambert.html

Gauss:
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Gauss.html

Lobachevski:
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Lobachevsky.html

Riemann:
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Riemann.html

Links