Word origin
ME < L 
satrapes < Gr 
satrapēs < OPers 
xšathrapāvan, lit., protector of the land < 
xšathra, dominion (< IE base *
kthēi-, to gain dominion > Gr 
ktēma, possession) + *
pā(y)-, to protect < IE base *
pō(i)-, to herd sheep, protect, cover > OE 
fothor, sheath