 After leaving the governorship in 1672 , Arnold likely attended to his commercial interests , and he was said to be the wealthiest person in the colony . He had a wharf and warehouse mentioned in his will , and he had commercial interests in the West Indies , evident from a 1674 letter that he wrote to his son @-@ in @-@ law , Roger Goulding , urging him to complete his ( Arnold 's ) business in the Barbados . 
