Jews as moneylenders in middle age Europe?

Is there any hard evidence that jewish people actually made their money through money lending during the middle ages in Europe? Historians point out that jews were money lenders but historians do not provide proof that jews actually made any money off of usury. Most Europeans who took loans would not have been able... show more Is there any hard evidence that jewish people actually made their money through money lending during the middle ages in Europe? Historians point out that jews were money lenders but historians do not provide proof that jews actually made any money off of usury. Most Europeans who took loans would not have been able to pay them back including the noble and royal families who took loans. Whenever the kings of Europe went deep into debt to the jews they just expelled the jews from their country.

So how did jews actually make money in Europe during the middle ages?
Update: Jonathan:"You can easily go into the court rolls of any medieval kingdom and find plenty of cases of Jews suing successfully to enforce collection of loans or to hold onto collateral in default situations."
Where do I find the court rolls of any medieval kingdom?
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