Isaac Israeli (Isaac Judaeus)

Physician at Qayrawan to the first Fatimid caliph; author of the Book of Urine (Kitab al-Bawl) contested

Dates: died between c. 932 and c. 950 (sources differ) (source: Utrecht University Special Collections: De urinis by Isaac Israeli )
Chapters: IV. The Flask

Contested

For about four hundred years after Constantine the African's Latin translation, the Book of Urine circulated without proper credit to Isaac (one source).

Sources

Utrecht University Special Collections: De urinis by Isaac Israeli Museum or society

What the film says

Author of a celebrated Book of Urine who warned against fools prophesying from urine without seeing the patient.

Watch 17:15 in the film IV. The Flask

On the timeline

Early 10th century: Isaac Israeli, physician at Qayrawan to the first Fatimid caliph, writes the Book of Urine (Kitab al-Bawl). timeline
Late 11th century (1070-1078, or c. 1087): Constantine the African translates Isaac Israeli's Book of Urine into Latin. timeline
1280 and 1392: German (1280) and Catalan (1392) versions of Isaac Israeli's Book of Urine are made. timeline

Sources

Wikipedia: Isaac Israeli ben Solomon Secondary
Posen Library: Isaac Israeli, Book of Urine Secondary
Utrecht University Special Collections: De urinis by Isaac Israeli Museum or society