a seneschal is just an employee in a royal court, a seneschal doesn't rule anything or create anything, all they do is like administrative work, they run the kingdom basically. and the seneschal is described as being necessarily to keep the world running and there may even be a different seneschal per world
with all this in mind does that imply that there's actually a deity pantheon in the DD universe, created by the king who went and did something else and left the seneschal to run things (like how the FF13 deities work)