system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40k] Why did the Emperor favor Horus?
gpt
He found him first on Cthonia while he was very young, he was the only Primarch the Emperor actually raised, and for a while he was the only Primarch around so he got special treatment and attention. Because he was raised by the Emperor, he most closely embodied the Emperor's ideals, while the others were raised elsewhere and developed other ideals and morals.