User blog comment:Jabberwokk/The Romans/@comment-86.164.72.66-20110918202935/@comment-3146930-20110920212032

An alternate summary of the book talks about how the three are going to free Death (not death). Considering Thanatos is the Gos of Death (and in some cases, the personification of death). Also, his picture shows him in chains which goes with the "Death has been captured" thing.