Who is Quintus Metellus from The Jugurthine War and what is their importance?

Metellus becomes consul after Memmuis' revelations. Sallust describes him as incorruptible and his relentless pursuit of Jurgurtha sets up the Roman victory. One of the reasons he is so successful is that he reintroduces passion and discipline into a previously-corrupt and idle Roman army. He tries to block Maruis' ascent as consul for the reason that he is not a noble, but public opinion is against him.