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Not quite the traditional castaway rescue, but there was the case of the Meermin slave mutiny, where the imprisoned slavers used a message in a bottle to alert shore forces to the slave mutiny, resulting in the defeat of the slaves and rescue of the slavers. There's also the case of Chunosuke Matsuyama, where a shipwrecked Japanese seaman sent a message in ...

The Roman Empire had the cursus publicus, which maintained an infrastructure of horses and way stations. The messenger himself was supplied by the one sending the message. It was used for transporting messages, magistrates, and some heavy goods too. Important messages typically travelled at roughly 50 miles per day.

I think that the short answer to your question is: No. The Empire survived very well for about 400 years (let's say from the death of Augustus in 14 CE to circa 400 when the so-called migration of the peoples began to be felt in the Empire) with the same communications structure. Ancient states required much less centralized decision making than modern ...

In the link to Wikipedia that you have provided it is written that the most ancient form of cryptography is the classical cypher that was invented circa 1900 BC. Akkadian Empire knew writing and even had Enheduanna, the first poet in history whom we know by name, and established in 2334 BC and disestablished in 2154 BC. So the empire existed before ...

Wikipedia claims that, while color printing was known even in the earliest printed works, it was various Chromoxylography processes developed in the 1800's that first made color printing practical enough to be commonplace. In the 19th century a number of different methods of color printing, using woodcut (technically Chromoxylography) and other ...

People used paints from the very ancient time. When first books appeared, people quickly accustomed to paint the pages and make colorful images. In the Middle Ages the majority of books published had colorful images in them. The state symbols, coats of arms, military banners and religious icons were also colorful. With the invention of printing press the ...

From Wikipedia "In order to maintain control and improve administration, various schemes to divide the work of the Emperor by sharing it between individuals were tried between 293 and 324, from 337 to 350, from 364 to 392, and again between 395 and 480. Although the administrative subdivisions varied, they generally involved a division of labour between ...

I just know one thing about relilabillity. http://en.wikipedia.org/wiki/Caesar_cipher As i have read in a Computer Magazine a few years earlier, some of the Roman Emperors used Steganography. They have shaved the heads of their Slaves, who brought the Messages to someone else, and wrote Down the message on their heads like a tatoo. After this they waited ...