For 10 points, name these articles of furniture which included the Siege Perilous, at least thirteen of which surrounded the Round Table.
King Latinus proposes in Book XI of the Aeneid that gifts including gold, purple robes, and an ivory one of these objects be sent to the Trojans as a peace offering. In one account, an object of this type causes the death of an otherwise unimportant character named Moys. After using a large rock as one of these objects, (*) Pirithous was trapped forever in the Underworld. A particularly deadly one of these objects which represented Judas Iscariot was successfully claimed four hundred and fifty-four years after the death of Jesus, and was legendarily created by Joseph of Arimathea. The quest for the Holy Grail began after one of these objects was used by Galahad. For 10 points, name these articles of furniture which included the Siege Perilous, at least thirteen of which surrounded the Round Table.
King Latinus proposes in Book XI of the Aeneid that gifts including gold, purple robes, and an ivory one of these objects be sent to the Trojans as a peace offering.
chairs [or obvious equivalents such as thrones, seats, or otherwise more specific answers] 