<P> The Heroes of Olympus is a pentalogy of fantasy - adventure novels written by American author Rick Riordan . The novels detail a conflict between Greek and Roman demigods and Gaea , the earth goddess . The series is a sequel to Percy Jackson & the Olympians , which dealt with Greek gods . 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 fantasy - adventure novels written by American author Rick Riordan . The novels detail a conflict between Greek and Roman demigods and Gaea , the earth goddess . The series is a sequel to Percy Jackson & the Olympians , which dealt with Greek gods . 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 next series after percy jackson and the olympians
what is the next series after percy jackson and the olympians
The Heroes of Olympus
The Heroes of Olympus