Imperial Diadochian Post is a government-owned postal service company in Diadochia. The Imperial Diadochian Post was officially established in 1477 by a imperial decree of Emperor Manuel VI. The company has a virtual monopoly in the postal service industry in Diadochia. The company is responsible for the Diadochian postal service, mail collection and delivery throughout Diadochia. Deliveries are not made on Sundays nor are they made on public holidays.