What is "shirvanshah"

Shirvanshah also spelled as Shīrwān Shāh or Sharwān Shāh, was the title of the rulers of Shirvan, located in modern Azerbaijan Republic, from the mid-9th century to the early 16th century. The title remained in a single family, the Yazidids, an originally Arab but gradually Persianized dynasty, although the later Shirvanshahs are also known as the Kasranids or Kaqanids. The Shirvanshah established a native state in Shirvan (located in modern Azerbaijan Republic).