Where Did Alexios Get Thrown off?

Kassandra started as a Spartan child, raised by her parents Nikolaos and Myrrine. One day, both Kassandra and her younger sibling, Alexios, are thrown off Mount Taygetos in deference to an oracle's prophecy, with Kassandra herself being dropped by her father, Nikolaos.

Where was Alexios thrown off?

Kassandra attempted to save her brother and inadvertently pushed both the priest and Alexios off the cliff to their apparent deaths and was sentenced to death for murder. Nikolaos ended up causing her to fall from the top of Mount Taygetos.

Why was Alexios thrown off the mountain?

While trying to save her brother from being dropped from the mountain, Kassandra assaulted the priest holding Alexios, and both the priest and Alexios ended up falling off the mountain. As punishment for her crime, Nikolaos was forced to throw Kassandra off the mountain as well, and both siblings were presumed dead.