The South Arabian alphabet was used primarily in the Sabaean and
Minaean kingoms in the Southern edge of the Arabian Peninsula. It
is thought to have diverged from the
Proto-Sinaitic alphabet as
early as 1300 BCE, and a developing form appeared in Babylonia and
near Elath of the Gulf of Aqaba around the 8th/7th centuries BCE.
The South Arabian proper appears around 500 BCE, and continued to
be used until around 600 CE (at which time, of course, the entire
Arabian Peninsula was converted to Islam and Arabic became the most
important language).
There were also contemporary relatives of this alphabet further
to the north to write down the Thamudic,
Lihyanite, and Safaitic languages.
This script was transported across the Red Sea to Ethiopia,
where it transformed into classical Ethiopic
(Ge'ez) and modern-day Amharic.
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