In 1255 he was imprisoned as a surety for the tallage of the Jews, and two years later he was deposed from office, being succeeded by his brother, Hagin (Hayyim).
In 1259, according to Matthew Paris, he was said to have been converted to Christianity and confessed to having prepared poison for certain of the English nobles.
In 1266, he was again treated as a Jew and compensation to the amount of £50 was granted him for losses he had incurred during the First Barons' War.
[1] At Elias' death, an inquest made upon his estate declared him to be possessed of personal property to the value of 400 marks and of houses of the yearly rental of 100 shillings.
One of his houses appears to have been located on Sporier Street near the Tower of London; at the Edict of Expulsion in 1290, it was granted to Chicksands Priory.
Jewish Encyclopedia bibliography: Prynne, Short Demurrer, part ii., sub annis; Jacobs, in Papers of the Anglo-Jew.