Al-Sijzi
Abu Sa'id Ahmed ibn Mohammed ibn Abd al-Jalil al-Sijzi (short for al-Sijistani) was a Persian mathematician. He was a Mathematician who made a special study of the intersections of conic sections and circles. He replaced the old kinematical trisection of an angle by a purely geometric solution (intersection of a circle and an equilateral hyperbola.)
Sources Suter: Die Mathematiker und Astronomen der Araber (80-81, 224, 1900).
See also Sijzi's Biography on St Andrew's School of MAthematics in Scotland
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