Nabataean Aramaic was the written language of the Arab kingdom of Nabataea, whose capital was Petra. The kingdom ("c." 200 BC – 106 AD) controlled the region to the east of the Jordan River, the Negev, the Sinai Peninsula and the northern Hijaz, and supported a wide-ranging trade network. The Nabataeans used imperial Aramaic for written communications, rather than their native Arabic. Nabataean Aramaic developed from Imperial Aramaic, with some influence from Arabic: "l" is often turned into "n", and there are some Arabic loanwords. Arabic influence on Nabataean Aramaic increased over time. Some Nabataean Aramaic inscriptions date from the early days of the kingdom, but most datable inscriptions are from the first four centuries AD. The language is written in a cursive script which was the precursor to the Arabic alphabet. After annexation by the Romans in 106 AD, most of Nabataea was subsumed into the province of Arabia Petraea, the Nabataeans turned to Greek for written communications, and the use of Aramaic declined.