In Ancient Greek, Persian courier was called "ἄγγαρος" (ángaros, “Persian mounted courier”), whence Latin "angarius", which is probably from an East Asian language (e.g., Sanskrit "अजिरा" (ajirā, “agile, swift”)). The word "angel" ("ἄγγελος") is probably loaned from and related to Greek "ἄγγαρος".