It's known that the First King Titan is an ancestor to the Reiss family.

But why was he there while all the other Titan Shifters were somewhere else, in the Homeland?

I think that the First King was possibly a runaway from the Homeland.

I have no clue why he would run away from the Homeland, it could be that he had different beliefs than the people from the Homeland.

Idk, I just had to point this out.