What was the name and occupation of the stranger at the three jolly bargemen

The stranger's name was Jaggers. He was a lawyer from London.

"My name," he said, "is Jaggers, and I am a lawyer in London. I am pretty well known. I have unusual business to transact with you, and I commence by explaining that it is not of my originating. If my advice had been asked, I should not have been here. It was not asked, and you see me here. What I have to do as the confidential agent of another, I do. No less, no more."