| Mattapany-Sewall Archeological Site | |
| Built: | 1663 |
| Added: | February 1, 1985 |
| Refnum: | 85000164 |
Mattapany-Sewall Archeological Site is an archaeological site in St. Mary's County, Maryland. It is located at the Patuxent River Naval Air Station on a level terrace approximately 45' above sea level, less than 1000' south of the Patuxent River in an unused wooded/grassy tract. Documentary evidence identifies the site as Mattapany-Sewall, a manor established in 1663 and occupied from 1666 to 1684 by Charles Calvert, 3rd Baron Baltimore. It served as a governmental meeting place and colonial arsenal, and was the scene of the 1689 battle, known as the Protestant Revolution of 1689, in which Maryland's Proprietary government was overthrown.[1]
It was placed on the National Register of Historic Places in 1985.