If you volunteered to deal with removing a huge, hairy spider from your bathroom ceiling, your whole family would be grateful for your gallant actions. The adjective gallant means "heroic or brave."
In the past, gallant was used to describe a man's behavior toward a woman, especially if he saved her from something or helped her with something she was unable to do on her own. It can still be used that way, but more often it describes any kind of bravery, and it is just as correct to describe a woman's bravery as gallant as it is a man's.
adj having or displaying great dignity or nobility
n a man who is much concerned with his dress and appearance
George Bryan Brummell
English dandy who was a fashion leader during the Regency (1778-1840)
a conceited dandy who is overly impressed by his own accomplishments
a British dandy in the 18th century who affected Continental mannerisms