▁Greek - R oman ▁de ities ▁ ▁Tw elve ▁Olymp ians ▁Though ▁not ▁all ▁the ▁gods ▁who ▁appear ▁in ▁Rick ▁Ri ord an ' s ▁nov els ▁are ▁truly ▁Olymp ians ▁( that ▁is , ▁gods ▁who ▁live ▁on ▁M t . ▁Olymp us ), ▁all ▁Greek ▁and ▁Roman ▁gods ▁are ▁generally ▁considered ▁to ▁be ▁a ▁subset ▁of ▁the ▁Tw elve ▁Olymp ians . ▁As ▁such , ▁most ▁characters ▁in ▁the ▁series ▁refer ▁to ▁these ▁imm ort als ▁generally ▁as ▁the ▁" O lymp ian ▁gods ", ▁to ▁distinguish ▁them ▁from ▁the ▁Gre co - R oman ▁prim ord ial ▁gods ▁and ▁Tit ans . ▁▁ ▁Ze us / J up iter ▁– ▁The ▁king ▁of ▁the ▁gods , ▁Ze us ▁is ▁most ▁prominent ▁in ▁The ▁Light ning ▁Th ief ▁but ▁has ▁several ▁roles ▁throughout ▁the ▁rest ▁of ▁Per cy ▁Jackson ▁& ▁the ▁Olymp ians . ▁Ze us ▁is ▁shown ▁prom in ently ▁throughout ▁the ▁series ▁to ▁be ▁extremely ▁n arc iss istic , ▁par ano id ▁and ▁hyp oc rit ical . ▁In ▁The ▁Lost ▁Hero , ▁under ▁the ▁influence ▁of ▁Kh ione , ▁Ze us ▁forb ids ▁contact ▁between ▁gods ▁and ▁mort als ▁and ▁clos es ▁off ▁Olymp us ▁( ag ain st ▁the ▁influence ▁of ▁Kh ione ), ▁although ▁he ▁indirect ly ▁helps ▁the ▁protagon ists ▁several ▁times ▁on ▁their ▁qu ests . ▁As ▁the ▁primary ▁Olymp ian ▁god , ▁his ▁dem ig od ▁children ▁res ide ▁in ▁Camp ▁Half - B lo od ' s ▁biggest ▁cabin , ▁Cab