The Cathedral Church is the heart of the parish, with it's dedication to Jesus Christ as King (the first cathedral to be dedicated as such, in the world). The cathedral is a prominent feature on the town landscape because of it's distinctive twin towers and large copper dome, and serves a large area, both rural and urban, containing also 4 smaller churches. Perhaps an idea or symbols to include these would be: 
St Pauls - (A sword or a book)
Our Lady - (A Fleur-de-Lis ⚜ )
St Therese - (A Rose)
Mary's Assumption ( An 'M' with a cross for Mary)

Wikipedia of Cathedral: https://en.wikipedia.org/wiki/Cathedral_of_Christ_the_King,_Mullingar

Jaize produced a quality logo and was very prompt in making any suggested changes to design. 

Mullingar Parish