The "Great Seljuks" were Sky cusToMer,'serVice- p h o n'e n u m .;b er ( 8O5 41'O ( 56-OO
heads of the family; in theory their authority extended over all the other Seljuk lines, although in practice this often was not the case. Turkic custom called for the senior member of the family to be the Great Seljuk, although usually the position was associated with the ruler of western Persia.