The English naval officer Robert Sansum During the Commonwealth, Robert Sansum commanded a number of ships: From 1651 to 1653, he commanded the small frigate, the Bryer. From 1654 to 1655, he commanded the 4th Rate Adventure. From 1655 to 1660 (the Restoration), he commanded the larger 4th Rate, the Portsmouth. This information is from R.C. Anderson's List of English Naval Captains 1642-1660, published by the Society for Nautical Research in 1964. I have found this to be a very valuable source.