Jamison ,
Just realised that I said the marriage cert said Denis Doyle ,I should have said Denis Ryan, (I was looking for Doyles when I saw your original post).
The Ryans in my family lived in Bolton Parade Dublin, my step grandmother was Elizabeth Ryan , her father was a James Ryan from Co. Limerick - according to the 1911 Census . I was always told he did something with horses though the census records him as being a Corporation labourer! This might make sense of my original post !