Who is SQUIRE JOHN TRELAWNEY from Treasure Island and what is their importance?

Squire Trelawney organizes the voyage, procures the ship, and hires the crew. He is described as a loyal, hard working man, but he is not always the best judge of character.... let's face it, he hired the crew. Trelawney also has difficulty keeping a secret. It is believed that Trelawney was responsible for exposing the fact they were searching for treasure.