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ASOIAF AU

All the dead ladies--Rowena Arryn, Minisa Whent Tully, Lyarra Stark and Joanna Lannister--are alive and well when the Harrenhal Tourney takes place. Cassana Estermont Baratheon is also living, because Steffon sent her in the earlier boat with Renly and his nurse. What impact does their being alive have  on events?