Caherconlish (Catherkenlish) may have been given a grant of murage dated 9/11/1338.
This was in the form of:-
Wording 
Granted by Edward III. (Regnal year 12).
Primary Sources 
The primary source is lost or obscure. moot 
Secondary Sources 
Lenihan, M., 1866, 
Limerick, its history and antiquities (Dublin) p. 740 
online copy
Comments 
CATHERKENLISH
1338 Nov. 9. Grant for stone wall. (Lenihan)
No other detail given, although the context might suggest a patent roll in Dublin. However there is nothing like this in CIRCLE. However the specific date does suggest Lenihan had seen something.
Seems to be a modest town at best, with no suggestion of actually being walled. Lenihan doesn't specific a defensive town wall. Was the grant for some modest, private wall not defensive?
     
Record created by Philip Davis. This record created 13/03/2012. Last updated on 28/05/2012. First published online 5/01/2013.