<P> The Heroes of Olympus is a pentalogy of adventure , mythological fiction and fantasy novels written by American author Rick Riordan that collectively form a sequel series to the Percy Jackson & the Olympians series . This series details a conflict between Greek and Roman demigods and Gaea , the earth goddess . Riordan introduces Roman mythology into his sequel series as well as several new characters . The first book of the series , The Lost Hero , was published on October 12 , 2010 . The final entry in the series , The Blood of Olympus , was published on October 7 , 2014 . </P>
<P> The Heroes of Olympus is a pentalogy of adventure , mythological fiction and fantasy novels written by American author Rick Riordan that collectively form a sequel series to the Percy Jackson & the Olympians series . This series details a conflict between Greek and Roman demigods and Gaea , the earth goddess . Riordan introduces Roman mythology into his sequel series as well as several new characters . The first book of the series , The Lost Hero , was published on October 12 , 2010 . The final entry in the series , The Blood of Olympus , was published on October 7 , 2014 . </P>
what is the second series of percy jackson called
what is the second series of percy jackson called
The Heroes of Olympus
The Heroes of Olympus