What is the password to the Gryffindor common room during Harry’s first year Christmas time?

Caput Draconis

Which Trojan prince abducted Helen, sparking the Trojan War? In the "Star Trek" universe, which species is known for its logic and pointed ears? What European river flows through Rome? The city of Dakar lies in which country? Who sang the 1997 single "I Believe I Can Fly"?