This might be him:
The Marriage Registers of Upper Canada/Canada West, Volume 14, Western District 1786-1856, Compiled by Dan Walker & Fawne Stratford-Devai, Global Heritage Press, Milton:
Marriages by Rev'd Jacob Iler, Baptist Minister, 1855 [return only not in register]:
Isaiah Stewart, to Mary Cowan. 1855, by banns. Rev. Iler.
Commemorative Biographical Record of the County of Essex, J. H. Beers & Co., Toronto, 1905, p. 410-411:
James Stewart, a farmer and carpenter in Gosfield North, is the last surviving member of a family long known in the County of Essex, where they were among the earliest of the pioneer settles, while still farther back he traces his ancestry to the famous Stewarts of Scotland. He was born in the County of Norfolk, Middleton township, Oct. 13, 1840, son of Rev. James and Jane (Philpox) Stewart.
Originally three brothers came from Scotland to America: Charles, grandfather of our subject, settled in Canada; John went to Pennsylvania and was killed during the Revolution; and James, a soldier in the British army, died near Amherstburg, in Malden township, after the war of 1812. Charles Stewart, with his wife, Peggy, made his home in Mersea township, and lived to the remarkable age of 104 years. He had seven children, all now deceased: John, Charles, Abel, Rev. James, Polly (wife of L. D. Vaughn), Peggy (wife of Michael G. Fox) and Tabitha (Mrs. George Brown).
Rev. James Stewart was born in 1794. While he owned and lived on a farm, his life work was in the Baptist ministry, and he was a well-known preacher in the County of Essex. His death occurred in 1841, while he was at Long Point, Canada, engaged in the discharge of ministerial duties. He was twice married, and by his first wife, Betsy (Fulmer), of Mersea township, had five children, David, John, Isaiah, Jane and Margaret, all now deceased...
Isaiah
Stewart
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