Martin originally planned for the fourth book to be called "A Dance with Dragons" with the story picking up five years after the events of "A Storm of Swords" (primarily to advance the ages of the younger characters). However, during the writing process it was discovered that this was leading to an overreliance on flashbacks to fill in the gap. After twelve months or so of working on the book, Martin decided to abandon much of what had previously been written and start again, this time picking up immediately after the end of "A Storm of Swords". He announced this decision, along with the new title "A Feast for Crows", at Worldcon in Philadelphia on September 1, 2001. He also announced that "A Dance with Dragons" would now be the fifth book in the sequence.