Premise: Phillip Calvert (1626 – 1682), also known as Philip Calvert, was the fifth Governor of Maryland during a brief period in 1660 or 1661. He was appointed by the royally chartered proprietor of Maryland, Charles Calvert, 3rd Baron Baltimore (1637–1715), as a caretaker to replace Lt. Gen Josias Fendall (1628–1682), the fifth/sixth? provincial governor.
Hypothesis: Phillip Calvert died in his sleep.