Hi,
13 Jun 1841 Margaret Doherty Long Tower R.C. Church, Londonderry
15 Aug 1878 Mary Carr Long Tower R.C. Church
1 Sept 1888 Isabella Dunlop St. Patricks Church of Ireland, Coleraine.
Regards
Wow!

Thanks very much for the information, it is very much appreciated!

Can I ask where you got the information?
The information concerning the two Cassidy's sounds right, as in both were married in the Long Tower, which I had assumed. I know that Robert Brown married in the city of Derry and that his wife, as we had always assumed, was called Isabella Sterling and that they married sometime before 1917 but I can't find anything for an Isabella Sterling!

I hope it is okay for me to ask but would you be able to find anything relating to a marriage of a Robert Brown to an Isabella in Derry City itself between what I realise is more likely to be 1890 and 1917?
If not, then thanks for the help, it is very much appreciated!
