Many times in the play the merchant of venice shylock refers to the rights of foreigners in vemice .Is hee not a citizen of venice.If yes then why is he living there 

When Venetian merchants needed usurer capital to finance their business ventures, Jews flocked to Venice in large numbers. Shylock was one of them and thus, is a foreigner and not a citizen of Venice. He being a money-lender was treated as an outcast in the Christian dominated Venice. Inspite of that, Shylock was a successful entrepreneur who handled his business straightforward and charged high interest. Being the greedy person he is, he continued to stay in Venice for the momentary benefits.