Who is Giamo Casanunda from Lords and Ladies: A Novel of Discworld and what is their importance?

Giamo Casanunda is a dwarf. He is described as adventuresome and insatiable. Giamo is a swordsman, bandit, and stepladder repair man by trade. He is business card also names him the second greatest lover in the land. Giamo is romantically interested in Nanny Ogg.