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phryctoria wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 terms 2 use of beacons in ancient greece 3 phryctoriae and pyrseia 4 see also 5 references 6 external links toggle the table of contents phryctoria 6 languages català ελληνικά español français italiano македонски edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia means of communication used in ancient greece this article needs more citations please help improve this article by adding citations to reliable sources unsourced material may be challenged and removed find sources phryctoria news newspapers books scholar jstor january 2021 learn how and when to remove this message phryctoria greek φρυκτωρία was a semaphore system used in ancient greece the phryctoriae were towers built on selected mountaintops so that one tower phryctoria would be visible to the next tower usually 20 miles away the towers were used for the transmission of a specific prearranged message one tower would light its flame the next tower would see the fire and light its own terms edit a beacon was called phryctos φρυκτός 1 with the plural form phryctoi φρυκτοί 2 phryctoros φρυκτωρός referred to the person in charge of beacon signaling 3 while paraphryktoreuomenos παραφρυκτωρευόμενος one who sends improper beacon signals described someone who abuses this duty by transmitting false or misleading signals in ways that benefit the enemy as described by lysias one such man was caught in sicily by lamachus while secretly signaling to the enemy and was executed for his betrayal 4 use of beacons in ancient greece edit in the iliad homer describes the practice of beacons lit atop a city at sunset after a day of battle blazing high into the sky so that people far away especially those at sea might see them and come to help defend the city he compares these fires to the blazing light around achilles head sent by the goddess athena which shines toward heaven and terrifies the trojans 5 in aeschylus tragedy agamemnon a slave watchman character learns the news of troy s fall from mycenae by carefully watching a fire beacon 6 7 in herodotus account beacons on sciathus were used to alert the greek forces at artemisium that the persian fleet had arrived and captured some greek ships this warning allowed the greeks to respond by changing their anchorage and adjusting their defensive positions 8 herodotus also mentions that during mardonios expedition against athens he intended to signal king xerxes in sardis that he had taken athens using a line of beacons across the islands 9 thucydides wrote that during the peloponnesian war the peloponnesians who were in corcyra were informed by night time beacon signals of the approach of sixty athenian vessels from lefkada 10 while when cnemus attacked salamis island the salaminians informed the athenians and asked for help by beacon fires 11 greek authors note that in the persian empire there were couriers watchmen messengers and signal fires these systems particularly the chain of signal fires stretching from the empire s farthest reaches to susa and ecbatana were so efficient that the king could learn about events across asia on the very same day they occurred 12 philip v of macedon during the first macedonian war employed a network of beacon fires to monitor enemy movements and coordinate responses across distant regions he sent men into phocis euboea and peparethos to select elevated positions suitable for lighting the beacons while he himself stationed at tisaeus a peak of great height to observe the signals the purpose of this system was to receive instant notice of any hostile activity so that philip could respond quickly to threats at the city of oreus however the system failed to function optimally although the beacons gave philip warning they were lit too late due to the treachery of plator the garrison commandant 13 pliny the elder notes that in asian part of the roman empire people erected beacons to warn against pirates 14 the byzantine encyclopedia suda writes that people raised beacons above their walls to communicate with nearby allies and neighbors when they saw an enemy approaching they used these lights to warn others to prepare for defense while the arrival of friendly forces was signaled to show that there was no need for alarm the meaning depended on how the beacons were handled a steady unmoving light indicated friends while a moving light signaled enemies 2 polybius in his work explained that fire signals were extremely useful in war because they allowed distant parties to learn quickly what was happening early beacons however were of little use as they could only convey a few prearranged messages and could not communicate unexpected events he then describes an improved method proposed by aeneas tacticus in which two identical earthenware vessels are filled with water each containing a floating cork which supports a rod divided into sections labeled with common wartime events spigots at the base of the vessels allow water to escape at the same rate so that when a sender raises a torch and lets the water flow until the corresponding label reaches the mouth of the vessel at which point the torch is lowered the receiver can interpret the message see hydraulic semaphore system while this method was a slight improvement over simple beacons it remained limited and imprecise as it could not foresee all contingencies or convey exact details polybius then introduces a more advanced torch and alphabet system which allows any message to be transmitted clearly and emphasizes that such methods require practice and habit to be effective see section below and the polybius square 15 polybius also wrote that pyrsourídas πυρσουρίδας were beacons established by perseus of macedonia across the entire region enabling him to receive rapid reports about events in different locations suda notes that this system was similar to the later byzantine beacon network 16 phryctoriae and pyrseia edit diagram of a fire signal using the polybius cipher ιn the 2nd century bc the greek engineers from alexandria cleoxenes greek κλεόξενος and democletus greek δημόκλειτος invented the pyrseia greek πυρσεία πυρσεία from πυρσός which means torch the letters of the greek alphabet were listed on a table each letter corresponded to a row and a column on the table by using two groups of torches five torches in every group the left indicating the row and the right the column of the table they could send a message by defining a specific letter through combination of light torches 17 the coding system was as follows 1 2 3 4 5 1 α β γ δ ε 2 ζ η θ ι κ 3 λ μ ν ξ ο 4 π ρ σ τ υ 5 φ χ ψ ω when they wanted to send the letter o omicron they fired five torches on the right set and three torches on the left set a small reconstruction of fire signals and beacons in kotsanas museum of ancient greek technology athens greece polybius writes that he later perfected the system see polybius square 15 see also edit byzantine beacon system optical communication polybius square greek hydraulic semaphore system references edit suda fruktos 1 2 suda fruktoi suda fruktwria suda fruktos homer iliad 18 210 aeschylus oresteia agamemnon in greek p 2 καὶ νῦν φυλάσσω λαμπάδος τό σύμβολον αὐγὴν πυρὸς φέρουσαν ἐκ τροίας φάτιν ἁλώσιμόν τε βάξιν 500 400bc sommerstein alan h 2009 aeschylus oresteia agamemnon cambridge ma loeb classical library harvard university press so now i am still watching for the signal flame the gleaming fire that is to bring news from troy and tidings of its capture herodotus the histories 7 183 herodotus the histories 9 3 thucydides peloponnesian war 3 80 diodorus siculus library 12 49 pseudo aristotle on the universe 398a 20 livy history of rome 28 5 28 7 pliny the elder the natural history 2 73 1 2 polybius histories 10 43 3 10 47 12 suda pi 3250 polybius the histories volume iv book 10 p 46 translated by w r paton revised by f w walbank christian habicht loeb classical library 159 cambridge ma harvard university press 2011 these torches having been lowered the dispatcher of the message will now raise the first set of torches on the left side indicating which tablet is to be consulted i e one torch if it is the first two if it is the second and so on next he will raise the second set on the right on the same principle to indicate what letter of the tablet the receiver should write down external links edit the medean wars part ii v t e telecommunications history beacon broadcasting cable protection system cable tv communications satellite computer network data compression audio dct image video digital media internet video online video platform social media streaming drums edholm s law electrical telegraph fax heliographs hydraulic telegraph information age information revolution internet mass media mobile phone smartphone optical telecommunication optical telegraphy pager photophone prepaid mobile phone radio radiotelephone satellite communications semaphore phryctoria semiconductor device mosfet transistor smoke signals telecommunications history telautograph telegraphy teleprinter teletype telephone history the telephone cases television digital streaming undersea telegraph line videotelephony whistled language wireless revolution pioneers nasir ahmed edwin howard armstrong mohamed m atalla john logie baird paul baran john bardeen alexander graham bell emile berliner tim berners lee francis blake jagadish chandra bose charles bourseul walter houser brattain vint cerf claude chappe yogen dalal donald davies daniel davis jr amos dolbear thomas edison philo farnsworth reginald fessenden lee de forest elisha gray oliver heaviside robert hooke erna schneider hoover harold hopkins gardiner greene hubbard bob kahn dawon kahng charles k kao narinder singh kapany hedy lamarr roberto landell innocenzo manzetti guglielmo marconi robert metcalfe antonio meucci samuel morse jun ichi nishizawa charles grafton page radia perlman alexander stepanovich popov tivadar puskás johann philipp reis claude shannon almon brown strowger henry sutton charles sumner tainter nikola tesla camille tissot alfred vail thomas a watson charles wheatstone vladimir k zworykin internet pioneers transmission media coaxial cable fiber optic communication optical fiber free space optical communication internet molecular communication radio waves wireless transmission line telecommunication circuit network topology and switching bandwidth links network switching circuit packet list nodes terminal telephone exchange multiplexing space division frequency division time division polarization division orbital angular momentum code division concepts communication protocol computer network data transmission store and forward telecommunications equipment types of network cellular network ethernet isdn lan mobile ngn public switched telephone radio television telex uucp wan wireless network notable networks arpanet bitnet cyclades fidonet internet internet2 janet npl network tanet toasternet usenet locations africa americas north south antarctica asia europe oceania global telecommunications regulation bodies telecommunication portal category outline commons retrieved from https en wikipedia org w index php title phryctoria oldid 1375836660 categories ancient greek technology ancient greek military equipment communications in greece history of telecommunications signalling lights beacons semaphore hidden categories articles with short description short description is different from wikidata articles needing additional references from january 2021 all articles needing additional references articles containing greek language text cs1 greek language sources el this page was last edited on 20 september 2026 at 11 03 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents phryctoria 6 languages add topic