An 'S' in Secretary's hand usually has a loop at the bottom.
This letter doesn't.
I'm also not convinced the first vowel is an 'e'.
This scribe nearly always writes the typical 'backwards' 'e' of this hand. The first vowel looks more like an 'o'.
Is there another instance in the will of a capital 'S' and a capital 'C' for comparison?
It sounds like there might be the word 'Sussex' somewhere?
Added:
What year is this Gigi?
Goggle searches bring up Sir Roger Lewknor died 1404, born at 'Cuckfield', Sussex.
Is this the same man?