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PETRAPositron-Electron Tandem Ring Accelerator (PETRA) is one of the particle accelerators at DESY in Hamburg, Germany. From 1978 to 1986 it was used to study electron-positron collisions. In one of these studies the first direct evidence for gluons was found in three jet events. The modification called PETRA-II is a source of high-energy synchrotron radiation and also a pre-accelerator for the HERA. A planned upgrade in 2007 will convert it to PETRA-III, which will be a high intensity source for synchrotron radiation. ==References and external links== *[http://www.desy.de/pr-info/desyhome/html/presse/glossary.html#P DESY glossary] Particle colliders Petra:''This article is about the Jordanian site of Petra. For other meanings see Petra (disambiguation)'' Petra (''rock'' in Greek language) is an archaeological site in Jordan, lying in a basin among the mountains which form the eastern flank of Wadi Araba, the great valley running from the Dead Sea to the Gulf of Aqaba. == History == The descriptions of Strabo, Pliny the Elder, and other writers identify Petra as the capital of the Nabataeans and the center of their caravan trade. Walled in by towering rocks and watered by a perennial stream, Petra not only possessed the advantages of a fortress but controlled the main commercial routes which passed through it to Gaza in the west, to Bostra and Damascus in the north, to Elath and Leuce Come on the Red Sea, and across the desert to the Persian Gulf. From the Araba, travellers approach by a track which leads round Jebel Haroun (Aaron's Mountain) and enters the plain of Petra from the south; it is just possible to find a way in from the high plateau on the north; but the most impressive entrance is from the east, down a dark and narrow gorge, in places only 10 or 12 ft. wide, called the Sik (or ''Siq''), i.e. the shaft, a split in the huge sandstone rocks which serves as the waterway of the Wadi Musa. Near the end of the defile stands the most elaborate of the ruins, ''Khasneh al Faroun'' or "the Treasury of Pharaoh", not built but hewn out of the cliff; a little farther on, at the foot of the mountain called en-Nejr, comes the theatre, so placed as to bring the greatest number of tombs within view; and at the point where the valley opens out into the plain the site of the city is revealed with striking effect. Almost enclosing it on three sides are rose-coloured mountain walls, divided into groups by deep fissures, and lined with rock-cut tombs in the form of towers. The stream of Wadi Musa crosses the plain and disappears among the mountains opposite; on either bank, where the ground is fairly level, the city was built. Among the ruins on the south bank stand the fragments of a temple called ''Kasr Faroun'' of late Roman date; just beyond this rises a rocky height which is usually regarded as the acropolis. A position of such natural strength must have been occupied early, but we have no means of telling exactly when the history of Petra began; the evidence seems to show that the city was of relatively late foundation, though a sanctuary (see below) may have existed there from very ancient times. This part of the country was assigned by tradition to the Horites, i.e. probably "cave-dwellers", the predecessors of the Edomites (Genesis xiv. 6, xxxvi. 20-30; Deut. ii. 12); the habits of the original natives may have influenced the Nabataean custom of burying the dead and offering worship in half-excavated caves. But that Petra itself is mentioned in the Old Testament cannot be affirmed with certainty; for though Petra is usually identified with Sela which also means "a rock", the Biblical references (Judges i. 36; Isaiah xvi. i, xlii. 11; Obad. 3) are far from clear. 2 Kings xiv. 7 seems to be more explicit; in the parallel passage, however, Sela is understood to mean simply "the rock" (2 Chr. xxv. 12, see LXX). Hence many authorities doubt whether any town named Sela is mentioned in the Old Testament. What, then, did the Semitic inhabitants call their city? Eusebius and Jerome (''Onom. sacr.'' 286, 71. 145, 9; 228, 55. 287, 94), apparently on the authority of Josephus (''Antiquities of the Jews'' iv. 7, 1~ 4, 7), assert that Rekem was the native name. But in the Aramaic versions Rekem is the name of Kadesh; Josephus may have confused the two places. Sometimes the Aramaic versions give the form Rekem-Geya, which recalls the name of the village El-ji, south-east of Petra; the capital, however, would hardly be defined by the name of a neighbouring village.The Semitic name of the city, if it was not Sela, must remain unknown. The passage in Diodorus Siculus (xix. 94-97) which describes the expeditions which Antigonus sent against the Nabataeans in 312 BC is generally understood to throw some light upon the history of Petra, though it must be admitted that the petra referred to as a natural fortress and place of refuge cannot be a proper name, and the description at any rate implies that the town was not yet in existence. Brünnow thinks that "the rock" in question was the sacred mountain en-Nejr (above); but Buhl suggests a conspicuous height about 16 miles north of Petra, Shobak, the Montreal (Crusader castle) of the Crusaders. More satisfactory evidence of the date at which the earliest Nabataean settlement began is to be obtained from an examination of the tombs. Two types may be distinguished broadly, the Nabataean and the Graeco-Roman. The Nabataean type starts from the simple pylon-tomb with a door set in a tower crowned by a parapet ornament, in imitation of the front of a dwelling-house; then, after passing through various stages, the full Nabataean type is reached, retaining all the native features and at the same time exhibiting characteristics which are partly Egyptian and partly Ancient Greece. Of this type there exist close parallels in the tomb-towers at el-I~ejr [?] in north Arabia, which bear long Nabataean inscriptions, and so supply a date for the corresponding monuments at Petra. Then comes a series of tombfronts which terminate in a semicircular arch, a feature derived from north Syria, and finally the elaborate façades, from which all trace of native style has vanished, copied from the front of a Roman temple. The exact dates of the stages in this development cannot be fixed, for strangely enough few inscriptions of any length have been found at Petra, perhaps because they have perished with the stucco or cement which was used upon many of the buildings. We have, then, as evidence for the earliest period, the simple pylon-tombs, which belong to the pre-Hellenic age; how far back in this stage the Nabataean settlement goes we do not know, but not farther than the 6th century BC. A period follows in which the dominant civilization combines Greek, Egyptian and Syrian elements, clearly pointing to the age of the Ptolemaic dynasty. Towards the close of the 2nd century BC, when the Ptolemaic and Seleucid dynasty kingdoms were equally depressed, the Nabataean kingdom came to the front; under Aretas III Philhellene, (c.85 BC - 60 BC), the royal coins begin; at this time probably the theatre was excavated, and Petra must have assumed the aspect of a Hellenistic Greece city. In the long and prosperous reign of Aretas IV Philopatris, (9 BC - AD 40), the fine tombs of the el-I~ejr [?] type may be dated, and perhaps also the great High-place. Image:Jordan-Petra.jpg Then the city became more and more Romanized. In AD 106, when Cornelius Palma was governor of Syria, that part of Arabia under the rule of Petra was absorbed into the Roman Empire, and the native dynasty came to an end. But the city continued to flourish. It was visited in 131 by Hadrian, and stamped Adrianè Petra on its coins in gratitude for the emperor's benefactions; the superb IJazne, probably a temple for the worship of Isis, and the Dër, which resembles the IJazne in design, belong to this period. A century later, in the time of Alexander Severus, when the city was at the height of its splendor, the issue of coinage comes to an end, and there is no more building of sumptuous tombs, owing apparently to some sudden catastrophe, such as an invasion by the neo-Irann power under the Sassanid dynasty dynasty. Meanwhile as Palmyra, Syria (fl. 130 - 270) grew in importance and attracted the Arabian trade away from Petra, the latter declined; it seems, however, to have lingered on as a religious centre; for we are told by Epiphanius of Cyprus (c.315 - 403) that in his time a feast was held there on December 25 in honor of the virgin Chaabou and her offspring Dusares (''Haer.'' 51). The chief god of Petra was Dushara, i.e. the lord or owner of Shara he was worshipped under the form of a black rectangular stone, a sort of Petraean Kaaba. Associated with Dushara was Allat, the chief goddess of the ancient Arabs. Sanctuary chambers may be seen at various points in the site of Petra, and many places of sacrifice open to the sky are met with among the tombs, marked by remains of altars. But most eminent of all was the great High-place which has recently been discovered on en-Nejr (or Zibb at 61). It consists of a rock-hewn altar of burnt-offering with a place for killing the victims beside it and a shallow court, perhaps intended to hold water, in front: the most complete specimen of an ancient Semitic sanctuary that is known. Not far off are two obelisks cut out of the solid rock which has been removed to the level of their bases; these were either idols of Dushara, and Allat, or more probably were designed to mark the limits of the izaram of the sanctuary. West of the obelisks are three other places of sacrifice; and on the rocks below worshippers have carved their names (Cf S. ii. 390-404). En-Nejr, with the theatre at its foot, must have been the sacred mountain, the original sanctuary of Petra, perhaps the very high mountain of Arabia called Dusare after the god Dusares referred to by Steph. Byz. . Christianity found its way into Petra in early times; Athanasius mentions a bishop of Petra (Anhioch. 10) named Asterius; at least one of the tombs (the "tomb with the urn?") was used as a church; an inscription in red paint records its consecration "in the time of the most holy bishop Jason" (447). The Christianity of Petra, as of north Arabia, was swept away by the Islamic conquest of 629 - 632. Under the Kingdom of Jerusalem Petra was occupied by Baldwin I of Jerusalem and formed the second fief of the barony of Kerak (in the Lordship of Oultrejordain) with the title Château de la Valée de Moyse or Sela; it remained in the hands of the Franks till 1189; fragments of the Crusaders' citadel are still standing near the High-place on en-Nejr. The ruins of Petra were an object of curiosity in the middle ages and were visited by the Sultan Bibars of Egypt towards the close of the 13th century. The first European to describe them was Johann Ludwig Burckhardt (1812). All former descriptions are now superseded by the magnificent work of Brünnow and Domaszewski, ''Die Provincia Arabia'' (1904), who have minutely surveyed the whole site, classified the tombs, and compiled the accounts of earlier investigations; and by the independent researches of Dalman, ''Petra und seine Felsheiligtühmer'' (1908), and of Musil, ''Arabia Petraea'' (1907-1908). The ''Corpus Inscr. Sem.'' ii. 305 sqq., should be consulted, and the descriptions in Baedeker-Socin's ''Palestina'' (7th edition), and ''Revue biblique'' for 1897, 1898, 1903. ==Petra today== * On December 6, 1985 Petra was recognized as a World Heritage Sites by UNESCO. * In 2004 London-based Edward Cullinan Architects was appointed to design a new £3 million gateway to Petra to enhance access for all visitors, whether archaeological or tourist. It is working in joint venture with Jordanian form Bitar Consultants on the project, run under the auspices of the Ministry of Tourism and Antiquities and funded by the World Bank. Design work began in September 2004 and construction is scheduled to begin in early 2006 * John William Burgon famously wrote that Petra was a "rose red city half as old as time". Although at that time Burgon had never been to Petra himself, the phrase has become strongly associated with Petra. In fact the rocks of Petra are of many hues, few could properly be described as "rose red". ==Note== Exterior shots of the "Treasury" were used in the closing scenes of ''Indiana Jones and the Last Crusade''. The interior does not, unfortunately, live up to the movie. It has also appeared in several other movies, including 1977's ''Sinbad and the Eye of the Tiger''. ==External links== *[http://wikitravel.org/en/article/Petra Wikitravel: Petra] *[http://www.isidore-of-seville.com/petra/ The Complete Petra (web directory)] *[http://www.raingod.com/angus/Gallery/Photos/MiddleEast/Jordan/Petra/index.html Angus McIntyre's Petra Site] *[http://www.brown.edu/Departments/Anthropology/Petra/ Brown University excavations at the Great Temple] Roman towns and cities Archaeological sites Jordan PetraI am not sure that the Category:Roman towns and cities is suitable for this city, as it simple was not :) Romans passed by the city, it was under the Roman Empire at some point, but it was build long before the Roman Empire entered the region, and it have a totally different architectural style than Roman cities. I am no expert, but this is how I see it. -- User:Isam 01:46, 7 Aug 2004 (UTC) The Romans used it as an administrative center and built temples, a street grid, and a Roman-style theater. From the second century until its abandonment the city was almost completely Romanized (and later, Byzantinized). User:Fishal 20:44, 27 Sep 2004 (UTC) == Museum Exhibit == The Cincinnati Art Museum in Cincinnati, Ohio has an exhibit of artifacts on display as of 10/25/04. See other meanings of words starting from letter: PPA | PB | PC | PD | PE | PF | PG | PH | PI | PJ | PK | PL | PM | PN | PO | PR | PS | PT | PU | PW | PX | PY | PZ |Words begining with Petra: PETRA Petra Petra Petra,_Jordan Petra,_Spain Petrach_Crater Petrach_crater Petrades Petralia_Sottana Petrarca_Padova Petrarch Petrarch Petrarchan Petrarchan_sonnet Petrarchus Petrarch_(crater) Petrarch_Crater Petrarch_crater Petrashevsky_Circle Petrashevsky_circle Petra_(band) Petra_(disambiguation) Petra_(Lesbos),_Greece Petra_(Lesvos),_Greece Petra_Arkanian Petra_Burka Petra_genetrix Petra_Kelly Petra_Kelly Petra_Mandula Petra_Nemcova Petra_Nemcová Petra_Nemkova Petra_Pau Petra_Verkaik |
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