Byzantium (spacecraft)
From Tardis Wiki, the free Doctor Who reference
The Byzantium was a category four Star Liner which the Doctor witnessed crashing alongside River Song and Amy Pond during the 51st century. It carried the last of the Weeping Angels and when the ship crashed, the Angel was let loose (DW: The Time of Angels). When River Song goes through her diary in DW: Silence in the Library to check wherabouts the Doctor is in his timeline, she mentions "the crash of the Byzantium".