In his 1860 book, Richard Harvey Phelps said, "[Prince] was a servant to different officers in the Revolutionary war [and] had been sent on errands by George Washington."  Considering his 81 years enslaved, broken promises of freedom and 23 years imprisoned, I take Prince at his word when he said he served in the Revolutionary war with George Washington, but I realize our institutions would like broader confirmation.  I may have located that information.

As stated previously, "Mortimer" was not used as a surname to reference Prince until 1860...26 years after he died.  In life, particularly in his 1811 court case, he was referred to as "Prince Negro".  In researching Muster Rolls for Connecticut Regiments during the Revolution, I can only find 3 individuals referenced similarly; one was in the 3rd Regiment and died in June 1777; another was in the 2nd Regiment and is listed as "Native American".  The remaining person is listed as a Black person who is part of the Connecticut 5th Regiment.  The records show the following:

1. "Prince Negro" enlisted on May 1st, 1777.
2. His term of enlistment was "Duration of War".
3. He was on guard in Haverstraw, NY in Oct. 1777; an Army lookout for British activity on the Hudson.
4. He was at Valley Forge with George Washington from December 1777 until June 1778.
5. He is listed as "Sick in Quarters" in March of 1778, as were many of George Washington's troops at Valley Forge.  2 - 3k troops died there from illness. 
6. In June 1778, as George Washington led the Continental Army towards the British who were retreating from Philadelphia and headed to New York, Prince is listed as "Left sick on road".  He's then listed as "Sick in Englishtown" in July 1778.  So, after traveling 70 of the 80 miles from Valley Forge to the famous "Battle of Monmouth", Prince was too sick to proceed, so was left 10 miles away in Englishtown where his service ended on June 3rd, 1778.

So, we have an African American, from Connecticut, referred to by the same name used to refer to Prince in his 1811 court case (Prince Negro), who Served in the Revolutionary war and was in the same location as George Washington for 6 months.  All of this aligns with what Prince said and what Richard Harvey Phelps wrote in his 1860 book.

I never needed any additional info to believe the account of Prince, but I've forwarded this information on to the "Daughters of the Revolution", The Wethersfield Historic Society, The Wethersfield Veterans Commission and to The Middlesex County Historic Society.  I'm looking forward to hearing their thoughts.  Hopefully, we can get full acknowledgment of his life and service; something more fitting than having him buried unmarked under Wethersfield Cove Park and only referenced unceremoniously as a past inmate who died at old Wethersfield prison.  More to come.