sometime between january and march 47 bc caesar's reinforcements arrived. these included soldiers led by mithridates of pergamon and antipater the idumaean, who would receive roman citizenship for his timely aid (a status that would be inherited by his son herod the great). ptolemy xiii and arsinoe iv withdrew their forces to the nile river, where caesar attacked them and forced ptolemy xiii to flee by boat. it capsized, and he drowned. his body was later found nearby in the mud. ganymedes was perhaps killed in the battle. theodotos was found years later in asia by marcus brutus and executed. arsinoe iv was forcefully paraded in caesar's triumph in rome before being exiled to the temple of artemis at ephesus. cleopatra was conspicuously absent from these events and resided in the palace, most likely because she was pregnant with caesar's child (perhaps since september 47 bc). she gave birth to caesarion on 23 june 47 bc. caesar and cleopatra likely visited the tomb of alexander the great together. caesar also ensured the proper burial of pompey's embalmed head in a tomb near the eastern wall of alexandria.