Palestina Tertia
| Palaestina III Salutaris εξοικονόμησης Παλαιστίνη | |||||
| Province of the Byzantine Empire, Diocese of the East | |||||
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| Capital | Petra | ||||
| Historical era | Late Antiquity | ||||
| • | Established | c.390 | |||
| • | Persian occupation | 612–628 | |||
| • | Muslim conquest of Syria | 636 | |||
| Today part of |
 Israel Palestine Egypt Jordan Saudi Arabia
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Palaestina Salutaris or Palaestina Tertia was a Byzantine (Eastern Roman) province, which covered the area of the Negev (or Edom), Sinai (except the north western coast) and south-west of Transjordan, south of the Dead Sea. The province, a part of the Diocese of the East, was split from Arabia Petraea in the 6th century and existed until the Muslim Arab conquests of the 7th century.
In 105, the territories east of Damascus and south to the Red Sea were annexed from the Nabataean kingdom and reformed into the province of Arabia with a capital Petra and Bostra (north and south). The province was enlarged by Septimius Severus in 195, and is believed to have split into two provinces: Arabia Minor or Arabia Petraea and Arabia Maior, both subject to imperial legates ranking as consularis, each with a legion.
By the 3rd century, the Nabataeans had stopped writing in Aramaic and begun writing in Greek instead, and by the 4th century they had partially converted to Christianity, a process completed in the 5th century.
Petra declined rapidly under late Roman rule, in large part from the revision of sea-based trade routes. In 363 an earthquake destroyed many buildings, and crippled the vital water management system.
The area became organized under late Roman Empire as part of the Diocese of the East (314), in which it was included together with the provinces of Isauria, Cilicia, Cyprus (until 536), Euphratensis, Mesopotamia, Osroene, Phoenice and Arabia Petraea.
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