Wm Forsyth & Ann McPherson, Aberdeenshire

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I'm looking for ANY reference to William & Ann, my oldest known ancestors, as described in the following 1861 Rhynie parish record.

James FORSYTH, Private, Foot Artillery, widower of Helen Maconochie, died 3 February 1861 at Essie, aged 77 son of William FORSYTH, farmer, decd., and Ann FORSYTH, MS [maiden surname] McPHERSON, decd.

Any William FORSYTH and/or Ann McPHERSON lead would be greatly appreciated.  Based on James age, they would have married about 1784.  Thank you!