atabeg

(from the article `Iran`) ...Oxus, where he founded the Khwrezm-Shah dynasty ( 1077–1231). Regions elsewhere in Iran, on the passing of Seljuq supremacy, became independent ... The Salghurids were one of the several dynasties of atabegs (notables who acted as guardians and tutors of infant Seljuq princes) who were deputized ... ...
Found on http://www.britannica.com/eb/a-z/a/117

Atabeg

Atabeg, Atabek, or Atabey is a hereditary title of nobility of a mixed Iranic and Turkic origin, indicating a governor of a nation or province who was subordinate to a monarch and charged with raising the crown prince. The first instance of the title`s use was with early Seljuqs who bestowed it on the Persian vizier Nizam al-Mulk It was later use....
Found on http://en.wikipedia.org/wiki/Atabeg
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