What is "ptolemy-el-garib"

Ptolemy-el-Garib ( Arabic, more correctly al-gharīb, "Ptolemy the foreigner," explained as meaning "Ptolemy the unknown") was a Hellenistic pinacographer, probably of the Peripatetic school, who wrote a Life of Aristotle notable for its catalog of Aristotle's works. This work survives in an Arabic manuscript in Istanbul.