Rabi Nissim, a 14th century poetand traveller said:

I travelled from Spain,
I had heard of the city of Shingly
I longed to see an Israel King
Him, I saw with my own eyes.

It is a fact that the jews of Cochin has been there from the 5th to the 15th century (maybe earlier) and even had their own kingdom and their own king.
The first jew may have arrived in Kerala s early as during King Solomon's time and in the 2nd century, a roman merchant ship found a jewish colony in Shingly also known as Cranganore.