On January 17, 1644, he [Sir Sidney Mountagu (father of Sandwich)] married Ann, the widow of John Pey, a Westminster citizen. She was one of the Ishams of Lamport, a good Northamptonshire stock. Their married life lasted only a few months, for on September 25, 1644, Sir Sydney Mountagu died, and was buried at All Saints', Barnwell.
The lady married again, one Anthony Luther, of Kelvedon Hatch, Essex. She always subscribed
herself as "Dame Anne Mountagu," keeping the surname of her most distinguished husband.
---The life of Edward Mountagu. F.R. Harris, 1912.
Chart showing the number of references in each month of the diary’s entries.