Essex County, Massachusetts was created on May 10, 1643 by the General Court of the Massachusetts Bay Colony, when it ordered "that the whole plantation within this jurisdiction be divided into four sheires."
Old Style Calendar
Before 1752 the year began on Lady Day, March 25th,. Dates between January 1st and March 24th were at the end of the year. Old Style (O.S.) and New Style (N.S.) are used to indicate whether the year has been adjusted. Often both dates are used.
Genealogical and Family History of the State of New Hampshire by Ezra S. Stearns, William Frederick Whitcher, Lewis Publishing Company, Chicago
Ursula Scott, was the (daughter of Martha Scott, widow of Hon. John Scott, of Scott's Hall, county of Kent, England, and daughter of Sir George Northup.
Genealogical and Family History of the State of New Hampshire by Ezra S. Stearns is available on Kindle.