Aran or Arran, possibly the same as, or overlapping, Caucasian Albania, is the name of a region in Caucasus which since 1918 has become the Republic of Azerbaijan and Azerbaijan SSR. This new name was taken from the name of the Iranian province of Azarbaijan by the Ottoman empire and was later used to designate the newly created Soviet SSR, formed by incorporating the regions of Aran, Shervan and Talish-i Gushtasbi. Azarbaijan (in north-western Iran) has had that name from the ancient times.
The term Arran was replaced with Azerbaijan on May 22, 1918 in Tbilisi, by the pan-Turanist Turkish Democratic Musavat Party, with aims of claiming Iranian Azarbaijan.
Following the Arab invasion of present-day Azerbaijan in the 8th century, most of the former territory of Caucasian Albania was included under the name of Arran.
Aran and Azerbaijan were incorporated into the Safavi state by 1500s.