Hemerodromoi
Hemerodromoi (Ancient Greek: ἡμεροδρόμοι, lit. 'day-runners') or hemeroskopoi (Ancient Greek: ἡμεροσκόποι, lit. 'day-watchers') or dromokerykes (Ancient Greek: δρομοκήρυκες, lit. 'runner heralds') were specialized couriers in ancient Greece renowned for their exceptional endurance.