Aristotle called it "first philosophy", and distinguished it from mathematics and natural science (physics) as the contemplative (theoretikē) philosophy which is "theological" and studies the divine.
ˈæɹɪstˌɑːɾəl kˈɔːld ɪt "fˈɜːst fɪlˈɑːsəfi", ænd dɪstˈɪŋɡwɪʃt ɪt fɹʌm mˌæθɪmˈæɾɪks ænd nˈætʃɚɹəl sˈaɪəns fˈɪzɪks æz ðə kəntˈəmplətˌɪv θˈiəɹɪtˌaɪk fɪlˈɑːsəfi wˈɪtʃ ɪz "θiːəlˈɑːdʒɪkəl" ænd stˈʌdiz ðə dᵻvˈaɪn.