Peter Stewart made petitions for land in Northumberland County in 1791. A Peter Stewart also made petitions for land in Northumberland County in 1799 and in 1804. I am unsure when Peter Stewart Senior, (previously Junior), and his son moved there, however they did receive a grant (38298) of 400 acres of land in the County of  Northumberland County in Newcastle Parish on the south side of the Miramichi River in 1808. Peter Stewart Junior received lot 1 containing 200 acres and Peter Stewart Senior received lot 2 containing 200 acres. The grant was registered on 3 August 1808 and signed by John Odell.

The following is an 1820 note from Peter Stewart:
 
“To His Excellency the Lieutenant Governor The Honourable His Majesty’s Council and the Honourable the House of Assembly of the Province of New Brunswick; The Petition of Peter Stewart of the Parish of Nelson in the County of Northumberland;
 
Humbly Sheweth:
That Your Petitioner in the year One Thousand Eight hundred and sixteen, made arrangements to form an establishment in trade at Miramichi and left Britain under positive arrangements for that purpose, He arrived at Miramichi in May One thousand eight hundred and seventeen and has  ?    ?  continued in trade there ever since. That in One thousand eight hundred and eighteen Your Petitioner  made arrangement with Mr. Donald MacDonald of Sterling in Scotland who purchased a piece of land adjoining the home which they now occupy and have since made considerable improvements therein. Your Petitioner therefore humbly prays that the sum of forty five pounds  sixteen shillings and eight pence currency which have been charged as the ?   ?  and a half per cent on the amount of good impacted by them ever since their first commencement in business at Miramichi may be exchanged to them. And Your Petitioner Shall Ever Pray.
 
Miramichi 8 February 1820
Peter Stewart “   
 
So we can see that Peter and Margaret Mackenzie, and possibly Alexander Mackenzie, had definitely moved to Northumberland by 1817. However, I suspect they were there earlier. A Peter Stewart is listed[1] as a farmer in a directory living in Lower Newcastle or Nelson, Northumberland in 1865, 67 and 71. This could be Peter Stewart, son of Peter Stewart.
So Peter Stewart in 1820 was working in ‘trade’. I wonder if this has anything to do with the active lumber industry located there at that time. It is interesting to note that his son-in-law John Foy was active as a partner in ‘Lord and Foy’ in that industry in the same place. A Lord and Foy Brook in New Brunswick was named after ‘early lumbermen’


[1] Hutchinson Directory 1865; 1867; Lovell Directory 1871.