Donaldsons of Armagh

[*sparkle*]

I'm actually searching high and low for the birth details of Robert Donaldson (b 1791) reputedly somewhere in Armagh. I believe his father is William Donaldson (b abt 1774), but so far only have other trees to go on so I'm taking it with a pinch of salt...

Robert was a weaver and married Margaret Thomson in Glasgow in 1812, and they went on to have several children.

Is anyone else researching this family?
Has anyone any bright ideas on where I could look, as others seem to have made the link!?!

 Regards

Tracey