Vulcan

"'Your words have delineated very prettily a graceful Apollo: he is present to your imagination,--tall, fair, blue-eyed, and with a Grecian profile. Your eyes dwell on a Vulcan,--a real blacksmith, brown, broad-shouldered; and blind and lame into the bargain.'" (Bronte 445).

Charlotte Bronte here uses references to two Roman mythological characters to contrast not only the physical appearances of St. John Rivers and Edward Rochester, but also their characteristic personalities. Apollo, in Greek and Roman mythology, was a beautiful, perfectly formed "man," and was worshiped as the god of many things, including light--making him radiant and good. He was also the god of religious healing; St. John Rivers was a missionary, like Apollo, and also was a beautiful man, like him. On the other hand, Vulcan was the god of smithing, or metalworking--he was a blacksmith. Although he was married to Venus, the beautiful goddess of love (perhaps suggesting that Jane is a goddess, or a perfect lover?), he was not attractive in the traditional standards--he was broad-shouldered and dark, just like Rochester. He was the god of fire; this connects to Rochester's fiery personality and temper.

http://www.crystalinks.com/vulcanrome.html
http://www.pantheon.org/articles/a/apollo.html