Al-Kashkari ( ar, الكسكري; 322 in AH/c. 934 CE in

Kashkar Kashkar, also known as Kaskar, ( syc, ܟܫܟܪ), was a city in southern Mesopotamia. Its name appears to originate from Syriac ' meaning "citadel" or "town". Other sources connect it to ' "farming". It was originally built on the Tigris, across th ...

– 414 AH/1023 CE in Fushanj) was a hospital physician from

Baghdad Baghdad (; ar, بَغْدَاد , ) is the capital of Iraq and the second-largest city in the Arab world after Cairo. It is located on the Tigris near the ruins of the ancient city of Babylon and the Sassanid Persian capital of Ctesiphon. I ...

. In diagnosing mental disorder, al-Kashkari used criteria such the temperament of the patient as indicators to ascertain the nature of the mental disorder: sluggishness and forgetfulness point to a cold temperament, which requires a different treatment from a warm one, which is revealed through insomnia.

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